Annual report pursuant to Section 13 and 15(d)

Revenue Recognition - Schedule of Changes in Account Balances as a Result of the Adoptions of ACS 606 (Details)

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Revenue Recognition - Schedule of Changes in Account Balances as a Result of the Adoptions of ACS 606 (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Dec. 31, 2017
Assets          
Cash and cash equivalents   $ 11,298 $ 13,049    
Accounts receivable, net   10,082 18,877    
Inventory   19,531 21,831    
Prepaid expenses and other current assets   6,430 10,111    
Total current assets   47,341 63,868    
Property and equipment, net   1,442 1,071    
Other assets   6,676 2,406    
Total assets   55,459 67,345    
Liabilities and stockholders’ equity          
Current portion of long-term debt   9,821 301    
Accounts payable   7,234 27,295    
Accrued expenses   10,265 16,381    
Deferred revenue   291 4,223 $ 770  
Total current liabilities   27,611 48,200    
Income tax payable   1,961 807    
Long-term debt, less current portion   362 13,209    
Total liabilities   29,934 62,216    
Commitments and contingencies      
Common stock, $0.001 par value per share; 100,000,000 shares authorized: 20,437,235 shares issued and outstanding at December 31, 2019; 100,000,000 shares authorized; 15,591,357 shares issued and outstanding at December 31, 2018   20 15    
Preferred Stock      
Additional paid-in capital   191,751 148,641    
Accumulated deficit   (166,246) (143,527)    
Total stockholders’ equity   25,525 5,129   $ (89,911)
Total liabilities and stockholders’ equity   55,459 67,345    
Net revenues   116,251 135,665    
Cost of revenues   81,742 87,576    
Gross profit   34,509 48,089    
Operating expenses:          
Research and development   26,064 23,247    
Sales and marketing   13,908 12,228    
General and administrative   16,182 7,220    
Restructuring costs $ 747 736      
Total operating expenses   56,890 42,695    
Income (loss) from operations   (22,381) 5,394    
Interest expense   (1,522) (1,828)    
Other expense, net   (543) (565)    
Income (loss) before income taxes   (24,446) 2,031    
Income tax expense   (1,388) (754)    
Net income (loss)   (25,834) 1,277    
Net loss attributable to common stockholders   $ (25,834) $ (8,875)    
Net loss per share attributable to common stockholders, basic and diluted   $ (1.39) $ (2.57)    
Weighted–average shares used in computing net loss per share attributable to common stockholders, basic and diluted   18,603,582 3,447,283    
ASC 606          
Liabilities and stockholders’ equity          
Deferred revenue       $ 770  
Balances Without Adoption of Topic 606          
Assets          
Cash and cash equivalents   $ 11,298      
Accounts receivable, net   10,082      
Inventory   19,531      
Prepaid expenses and other current assets   6,430      
Total current assets   47,341      
Property and equipment, net   1,442      
Other assets   2,337      
Total assets   51,120      
Liabilities and stockholders’ equity          
Current portion of long-term debt   9,821      
Accounts payable   7,234      
Accrued expenses   10,265      
Deferred revenue   291      
Total current liabilities   27,611      
Income tax payable   1,931      
Long-term debt, less current portion   362      
Total liabilities   29,904      
Commitments and contingencies        
Common stock, $0.001 par value per share; 100,000,000 shares authorized: 20,437,235 shares issued and outstanding at December 31, 2019; 100,000,000 shares authorized; 15,591,357 shares issued and outstanding at December 31, 2018   20      
Preferred Stock        
Additional paid-in capital   191,751      
Accumulated deficit   (170,555)      
Total stockholders’ equity   21,216      
Total liabilities and stockholders’ equity   51,120      
Net revenues   116,251      
Cost of revenues   80,258      
Gross profit   35,993      
Operating expenses:          
Research and development   28,742      
Sales and marketing   13,908      
General and administrative   16,182      
Restructuring costs   736      
Total operating expenses   59,568      
Income (loss) from operations   (23,575)      
Interest expense   (1,522)      
Other expense, net   (543)      
Income (loss) before income taxes   (25,640)      
Income tax expense   (1,388)      
Net income (loss)   (27,028)      
Net loss attributable to common stockholders   $ (27,028)      
Net loss per share attributable to common stockholders, basic and diluted   $ (1.45)      
Weighted–average shares used in computing net loss per share attributable to common stockholders, basic and diluted   18,603,582      
Effect of Change Higher/(Lower) | ASC 606          
Assets          
Other assets   $ 4,339      
Total assets   4,339      
Liabilities and stockholders’ equity          
Income tax payable   30      
Total liabilities   30      
Commitments and contingencies        
Preferred Stock        
Accumulated deficit   4,309      
Total stockholders’ equity   4,309      
Total liabilities and stockholders’ equity   4,339      
Cost of revenues   1,484      
Gross profit   (1,484)      
Operating expenses:          
Research and development   (2,678)      
Total operating expenses   (2,678)      
Income (loss) from operations   1,194      
Income (loss) before income taxes   1,194      
Net income (loss)   1,194      
Net loss attributable to common stockholders   $ 1,194      
Net loss per share attributable to common stockholders, basic and diluted   $ 0.06