The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

No definition available.

Debt Obligations - Narrative (Details) - USD ($)		1 Months Ended		3 Months Ended		9 Months Ended		39 Months Ended
Debt Obligations - Narrative (Details) - USD ($)	Jun. 17, 2016	Dec. 31, 2014	May 31, 2014	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jul. 01, 2020	Dec. 31, 2016
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount				$ 0		$ 0			$ 3,733,000
Period For Warrant Term						5 years
Exercise price of warrants (in dollars per share)				$ 20.00		$ 20.00
Number of shares of stock warranted (shares)				1,901,918		1,901,918
Document Period End Date						Sep. 30, 2017
Working capital advance note payable, net of discount of $0 and $3,733 at September 30, 2017 and December 31, 2016, respectively				$ 0		$ 0			$ 3,267,000
Loss on extinguishment of debt				$ (3,378,000)	$ 0	$ (3,378,000)	$ 0
Term Loan \| Loan And Security Agreement
Debt Instrument [Line Items]
Covenant compliance, deposit account, percent of account balances (percent)	50.00%
Collateral account balance, covenant compliance amount	$ 50,000,000.0
Interest rate (percent)	7.00%
Debt Instrument, Unamortized Discount		$ 600,000
Period For Warrant Term		10 years
Exercise price of warrants (in dollars per share)		$ 9.44
Number of shares of stock warranted (shares)		63,559
Borrowing limit under Term loan and Revolving credit facility		$ 20,000,000
Final payment of existing term loans	$ 1,000,000.0
Termination fee	$ 200,000.0
Term Loan \| Loan And Security Agreement \| Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	3.25%	5.25%
Interest rate (percent)		8.75%
Promissory note \| Working Capital Advance
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount			$ 4,700,000
Face amount of debt			$ 7,000,000
Revolving Credit Facility \| Loan And Security Agreement
Debt Instrument [Line Items]
Borrowing limit under Term loan and Revolving credit facility		$ 4,000,000
Final payment of existing term loans	$ 100,000.0
Scenario, Forecast [Member] \| Term Loan \| Loan And Security Agreement
Debt Instrument [Line Items]
Final payment of existing term loans								$ 1,400,000.0
Silicon Valley Bank [Member] \| Term Loan \| Loan And Security Agreement
Debt Instrument [Line Items]
Covenant compliance, deposit account, percent of account balances (percent)	85.00%
Endo Ventures Supply Agreement
Debt Instrument [Line Items]
Initial term of supply agreement			8 years
Endo Ventures Supply Agreement \| Working Capital Advance
Debt Instrument [Line Items]
Initial term of supply agreement	8 years