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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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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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Amount, after accumulated amortization, of debt discount.

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Agreed upon price for the exchange of the underlying asset.

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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Risk-free interest rate assumption used in valuing an instrument.

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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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Loan and Security Agreements - Oxford Loan and Hercules Loan (Details)	1 Months Ended		6 Months Ended
	Feb. 28, 2015 USD ($) $ / shares shares	Dec. 31, 2012 USD ($) installment $ / shares shares	Jun. 30, 2017 USD ($) installment $ / shares shares	Aug. 31, 2016 USD ($)
Warrants \| Common stock warrants \| Hercules Capital, Inc.
Loan and Security Agreements
Common stock that can be purchased with warrants (in shares) \| shares	180,274
Exercise price of warrants (in dollars per share) \| $ / shares	$ 5.89
Significant assumptions used in preparing the option pricing model for valuing the Company's warrants
Volatility (as a percent)	75.00%
Risk free interest rate (as a percent)	1.22%
Life of treasury bonds	4 years
Strike price (in dollars per share) \| $ / shares	$ 5.89
Fair value of common stock (in dollars per share) \| $ / shares	$ 9.82
Expected life (in years)	4 years
Additional Paid-in Capital \| Hercules Capital, Inc.
Loan and Security Agreements
Fair value of common stock warrant issued with debt financing	$ 1,200,000
Warrants \| Common stock warrants
Loan and Security Agreements
Common stock that can be purchased with warrants (in shares) \| shares			62,505
Exercise price of warrants (in dollars per share) \| $ / shares			$ 6.00
Warrants \| Common stock warrants \| Oxford Finance LLC
Loan and Security Agreements
Common stock that can be purchased with warrants (in shares) \| shares		62,505
Exercise price of warrants (in dollars per share) \| $ / shares		$ 6.00
Secured debt \| Oxford Loan \| Oxford Finance LLC
Loan and Security Agreements
Amount borrowed		$ 15,000,000
Number of consecutive monthly principal installments \| installment		30
Final payment		$ 675,000
Repayment of existing debt	15,500,000
Secured debt \| Hercules Loan \| Hercules Capital, Inc.
Loan and Security Agreements
Maximum borrowing capacity	25,000,000
Facility Fee				$ 165,000
Fixed interest rate (as a percent)			9.00%
Number of consecutive monthly principal installments \| installment			23
Final payment			$ 610,500
Prepayment premium as percentage of outstanding principal			1.00%
Discount on debt	1,200,000
Secured debt \| Hercules Loan Tranche One \| Hercules Capital, Inc.
Loan and Security Agreements
Amount borrowed	16,500,000
Secured debt \| Hercules Loan Tranche Two \| Hercules Capital, Inc.
Loan and Security Agreements
Additional amount available			$ 8,500,000
Secured debt \| LIBOR \| Oxford Loan \| Oxford Finance LLC
Loan and Security Agreements
Interest rate (as a percent)		9.20%
Variable rate basis		Three-month U.S. Libor rate
Variable rate base (as a percent)		0.47%
Variable interest rate margin (as a percent)		8.73%
Secured debt \| Prime \| Hercules Loan \| Hercules Capital, Inc.
Loan and Security Agreements
Variable rate basis			Prime minus 4.25%
Variable interest rate margin (as a percent)			9.00%
Variable rate adjustment (as a percent)			4.25%
Equity financings \| Right to participate in future equity financings \| Hercules Capital, Inc. \| Maximum
Loan and Security Agreements
Equity financings amount	$ 2,000,000