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Commitments and Contingencies - Forgivable Grant (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) job | Dec. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Feb. 01, 2011 USD ($) job
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of government grant |  |  | $ 0 | $ 0 | $ 101,000 |
Other Commitments [Line Items] |  |  |  |  |  |
Recognition of IEDA government grant |  |  | 0 | 0 | $ 1,638,000 |
Forgivable Grant |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Recognition of IEDA government grant |  | $ 2,200,000 |  |  |  |
Deferred government grant obligation |  |  | $ 0 | $ 0 |  |
Forgivable Grant | Operating Expenses |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Recognition of IEDA government grant |  | 608,000 |  |  |  |
Forgivable Grant | Other Operating Income (Expense) |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Recognition of IEDA government grant |  | $ 1,600,000 |  |  |  |
Forgivable Grant | February 2011, 6% IDED Forgivable Grant |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt face amount |  |  |  |  |  | $ 2,300,000
Number of jobs failed to meet minimum wage requirements | job | 10 |  |  |  |  |
Number of jobs required to create and retain for a specific period of time | job |  |  |  |  |  | 251
Repayment of government grant | $ 88,000 |  |  |  |  |

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