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Long-Term Debt - Hercules Term Loan - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Mar. 21, 2017 | Feb. 27, 2015 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | $ 515
Hercules Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable rate basis |  |  |  | The Hercules Term Loan had a variable interest rate that was the greater of either (i) 9.40% plus the prime rate as reported from time to time in The Wall Street Journal minus 7.25%, or (ii) 9.40%. |
Prepayment charge not required to pay | 1.00% |  |  |  |
Loss on extinguishment of debt |  |  | $ 500 |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  | 9,063 |  |  |
Exercise price of warrants (in dollars per share) |  | $ 66.20 |  |  |
Exercisable period of warrants |  | 5 years |  |  |
Warrants expiration period |  | 2020-02 |  |  |
Minimum [Member] | Hercules Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage bearing variable rate |  | 9.40% |  |  |
Prime Rate [Member] | Hercules Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread, addition |  | 9.40% |  |  |
Basis spread, subtraction |  | 7.25% |  |  |

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