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Commitments and Contingencies - Leases (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2017 USD ($) | Jun. 30, 2017 USD ($) ft² | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) ft² item | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Operating Leases |  |  |  |  |  |
Deferred rent |  | $ 253 |  | $ 253 |  | $ 219
Rent expense |  | 300 | $ 300 | 600 | $ 500 |
Future minimum lease payments under noncancelable operating leases |  |  |  |  |  |
Reminder of 2017 |  | 799 |  | 799 |  |
2018 |  | 1,443 |  | 1,443 |  |
2019 |  | 1,294 |  | 1,294 |  |
2020 |  | 1,231 |  | 1,231 |  |
2021 |  | 1,246 |  | 1,246 |  |
Total future minimum payments |  | 6,013 |  | 6,013 |  |
Purchase commitments |  |  |  |  |  |
Purchase commitment due within one year |  | 600 |  | 600 |  | $ 3,700
Purchase commitment due beyond one year |  | $ 0 |  | $ 0 |  |
Domestic Office Leases |  |  |  |  |  |
Operating Leases |  |  |  |  |  |
The number of adjacent facilities rented | item |  |  |  | 2 |  |
Number of lease renewal periods | item |  |  |  | 2 |  |
Optional lease extension term |  |  |  | 3 years |  |
Area of leased space | ft² |  | 77,000 |  | 77,000 |  |
Domestic Office Leases | Maximum |  |  |  |  |  |
Operating Leases |  |  |  |  |  |
Tenant improvement allowance | $ 264 |  |  |  |  |
Foreign Subsidiaries Office Leases |  |  |  |  |  |
Operating Leases |  |  |  |  |  |
Area of leased space | ft² |  | 3,000 |  | 3,000 |  |

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- Definition Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year and thereafter. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
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