Represents the amortized total of end of term charge of debt agreement for the reporting period.

No definition available.

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Period of warrant to purchase new shares issued in the conversion of stock.

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Represents end of term fee that is to payable upon prepayment or repayment.

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No definition available.

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Number of draws available per debt agreement.

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No definition available.

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The term of payments that include both interest and principal, which commence at a later date as defined in the debt agreement.

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No definition available.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash outflow for loan and debt issuance costs.

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The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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Long-term debt - Senior Debt (Details)					1 Months Ended			12 Months Ended
Long-term debt - Senior Debt (Details)	May 11, 2016 USD ($)	Jul. 22, 2015 $ / shares shares	Sep. 25, 2014 USD ($) $ / shares shares	Mar. 28, 2014 USD ($) item $ / shares shares	May 31, 2016	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2014	Mar. 31, 2014
Long-term debt
Loss on debt extinguishment										$ (1,187,000)
Debt discount amortization								$ 961,000	$ 1,316,000	406,000
Senior debt (Hercules LSA)
Long-term debt
Maximum borrowing capacity per agreement				$ 25,000,000
Number of draws available per debt agreement \| item				4
Term of interest and principal payments, which commence at a later date					30 months
LSA end of term fee due upon prepayment or repayment				$ 1,100,000
Payments of end of term fee	$ 1,100,000
End of term charge amortization										121,000
Loss on debt extinguishment										1,187,000
Debt discount amortization										$ 104,000
Senior debt (Hercules LSA) \| Tranche 1
Long-term debt
Draws from senior debt note				$ 10,000,000
Interest rate (as a percent)												9.00%
Senior debt (Hercules LSA) \| Tranche 1 \| Series C Warrants Issued with Senior Debt
Long-term debt
Warrants issued (in shares) \| shares				60,000
Exercise price (in dollars per share) \| $ / shares				$ 5.00
Senior debt (Hercules LSA) \| Tranche 2
Long-term debt
Draws from senior debt note			$ 5,000,000
Interest rate (as a percent)											10.50%
Senior debt (Hercules LSA) \| Tranche 2 \| Series C Warrants Issued with Senior Debt
Long-term debt
Warrants issued (in shares) \| shares			110,000
Exercise price (in dollars per share) \| $ / shares			$ 5.00
Senior debt (Hercules LSA) \| Tranche 3
Long-term debt
Draws from senior debt note							$ 5,000,000
Interest rate (as a percent)							10.50%
Senior debt (Hercules LSA) \| Tranche 4
Long-term debt
Draws from senior debt note						$ 5,000,000
Interest rate (as a percent)						9.00%
Conversion, initial public offering \| Common Stock Warrants
Long-term debt
Warrants issued (in shares) \| shares		70,833
Exercise price (in dollars per share) \| $ / shares		$ 12.00
Warrants Term		5 years