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Notes Payable (Detail) - USD ($)		1 Months Ended	6 Months Ended
	Aug. 01, 2017	May 31, 2016	Jun. 30, 2016	May 18, 2016	Dec. 31, 2015	Feb. 28, 2015
Debt Instrument [Line Items]
Shares of common stock to purchase by warrant (in shares)						749,250
Warrant exercise price (in USD per share)						$ 0.01
Oxford EWB Loan
Debt Instrument [Line Items]
Debt instrument, face amount					$ 50,000,000
Debt instrument, additional borrowing under first amendment		$ 20,000,000
Proceeds from debt issuance		$ 19,900,000
Maturity fee, as a percent			5.25%
Maturity fee on amended balance, as a percent			6.25%
Outstanding balance			$ 70,000,000
Loan maturity fee			$ 5,000,000
Stated interest rate			9.25%
Monthly interest only payments			$ 539,600
Shares of common stock to purchase by warrant (in shares)		100,602		100,602
Warrant exercise price (in USD per share)		$ 9.94		$ 9.94
Debt instrument, covenant compliance, minimum restricted cash and certain eligible short term investments			10,000,000
Debt instrument, covenant compliance, minimum annual net revenue requirements			$ 70,000,000
Debt instrument, covenant compliance, minimum restricted cash and eligible term investments as a percent of outstanding balance			50.00%
Potential additional default interest			5.00%
Unamortized balance of debt discount			$ 5,100,000
Unamortized balance of debt issuance costs			$ 441,000
Oxford EWB Loan | Forecast
Debt Instrument [Line Items]
Monthly principal and interest payments	$ 2,600,000

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