| Entity Level Information - Additional Information (Details) $ in Thousands | 6 Months Ended | 12 Months Ended | 
|---|---|---|
| Jun. 30, 2020  USD ($)  Segment | Dec. 31, 2019  USD ($) | |
| Revenues From External Customers And Long Lived Assets [Line Items] | ||
| Number of reporting segment | Segment | 1 | |
| Allowance for credit losses | $ 52 | $ 52 | 
| Receivables | Customer Concentration | Customer One | ||
| Revenues From External Customers And Long Lived Assets [Line Items] | ||
| Concentration risk percentage | 43.00% | 40.00% | 
| Receivables | Customer Concentration | Customer Two | ||
| Revenues From External Customers And Long Lived Assets [Line Items] | ||
| Concentration risk percentage | 12.00% | 28.00% | 
| U.S [Member] | ||
| Revenues From External Customers And Long Lived Assets [Line Items] | ||
| Long-lived assets | $ 5,394 | $ 6,626 | 
| Asia Pacific [Member] | ||
| Revenues From External Customers And Long Lived Assets [Line Items] | ||
| Long-lived assets | $ 1,161 | $ 1,492 | 
| X | ||||||||||
| 
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
 | 
| X | ||||||||||
| 
- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
 | 
| X | ||||||||||
| 
- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
 | 
| X | ||||||||||
| 
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
 | 
| X | ||||||||||
| 
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 |