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v3.8.0.1

Notes Payable - (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2015 | Aug. 27, 2014 | Jun. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2015
Line of Credit Facility |  |  |  |  |
Proceeds from issuance of promissory notes |  |  |  |  | $ 5,000,000
Term Loan A |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Initial borrowings |  | $ 5,000,000 |  |  |
Proceeds from issuance of promissory notes |  | 5,000,000 |  |  |
Term Loan B |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Proceeds from issuance of promissory notes | $ 5,000,000 |  |  |  |
Other Term Loan |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Maximum borrowing capacity |  | 20,000,000 |  |  |
Credit Facility |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Initial borrowings |  |  |  | $ 10,000,000 |
Maximum borrowing capacity |  | $ 25,000,000 |  |  |
Number of monthly payments (in number of payments) |  |  |  | 36 |
Interest rate (as a percent) |  |  |  | 7.49% |
Percentage of amount outstanding due as a payment (as a percent) |  |  |  | 3.48% |
Effective interest rate (as a percent) |  |  |  | 11.20% |
Debt Instruments |  |  |  |  |
Financial covenants |  |  |  | 0 |
Final judgment amount that would trigger lender rights for remedy |  |  |  | $ 250,000 |
Basis spread |  |  |  | 5.00% |
Interest rate increase in the event of a default (as a percent) |  |  |  | 5.00% |
Minimum | Credit Facility |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Percentage of amount outstanding due as a payment (as a percent) |  |  |  | 1.00% |
Maximum | Credit Facility |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Percentage of amount outstanding due as a payment (as a percent) |  |  |  | 3.00% |
Warrant Liability |  |  |  |  |
Debt Instruments |  |  |  |  |
Exercise period |  |  | 7 years |  |
2014 and 2015 Warrants |  |  |  |  |
Debt Instruments |  |  |  |  |
Value of warrants |  |  | $ 200,000 |  |
Debt discounts |  |  | $ 200,000 |  |
2014 Warrants | Term Loan A |  |  |  |  |
Debt Instruments |  |  |  |  |
Number of shares after conversion of issued warrants (in shares) |  |  |  | 157,844 |
2015 Warrants | Term Loan B |  |  |  |  |
Debt Instruments |  |  |  |  |
Number of shares after conversion of issued warrants (in shares) |  |  |  | 157,844 |
Common stock warrants | Initial public offering |  |  |  |  |
Debt Instruments |  |  |  |  |
Number of shares after conversion of issued warrants (in shares) |  |  | 24,566 |  |
Exercise price of warrants (in dollars per share) |  |  | $ 12.2100 |  |

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