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Debt - Senior Secured Debt (Detail) - USD ($)				12 Months Ended
Debt - Senior Secured Debt (Detail) - USD ($)	Mar. 28, 2017	Feb. 14, 2017	May 03, 2016	Dec. 31, 2017	Dec. 31, 2016	Feb. 28, 2017	Dec. 31, 2015	May 23, 2013
Debt Instrument [Line Items]
Outstanding accrued interest and prepayment premium conversion, converted amount				$ 0	$ 17,934,000
Senior secured debt, net				32,804,000	53,638,000
Cash and cash equivalents				25,961,000	9,866,000		$ 2,789,000
Restricted cash				$ 500,000
Series AB Preferred Stock \| Restructured debt
Debt Instrument [Line Items]
Outstanding accrued interest and prepayment premium conversion, converted amount			$ 2,100,000
Number of shares issued upon conversion of debt, shares			1,660,530
Series A preferred stock \| Preferred Stock \| CRG conversion
Debt Instrument [Line Items]
Number of shares issued upon conversion of debt, shares	2,500,000			2,500,000
CRG Term Loan
Debt Instrument [Line Items]
Debt interest rate, stated percentage								11.00%
CRG Term Loan \| Restructured debt
Debt Instrument [Line Items]
Senior secured debt, net			$ 50,000,000
CRG Term Loan \| Restructured debt \| Common Stock
Debt Instrument [Line Items]
Number of shares converted			256,744
Term loan \| CRG conversion
Debt Instrument [Line Items]
Principal balance converted	$ 25,000,000			$ 25,000,000
Term loan \| Debt conversion CRG and WCAS
Debt Instrument [Line Items]
Principal balance converted		$ 27,500,000
Conversion rate (usd per share)	$ 10
Term loan \| CRG Term Loan \| Restructured debt
Debt Instrument [Line Items]
Debt interest rate, stated percentage			11.00%
Minimum cash balance covenant				5,000,000		$ 2,000,000
Term loan \| CRG Term Loan \| Restructured debt \| Common Stock
Debt Instrument [Line Items]
Number of shares converted			4,649,859
Term loan \| CRG Term Loan \| Series AB Preferred Stock \| Restructured debt
Debt Instrument [Line Items]
Outstanding accrued interest and prepayment premium conversion, converted amount			$ 16,500,000
Number of shares issued upon conversion of debt, shares			8,609,824
Cash interest \| CRG Term Loan
Debt Instrument [Line Items]
Debt interest rate, stated percentage								7.50%
Payment-in-kind (PIK) interest
Debt Instrument [Line Items]
Senior secured debt, net				$ 7,929,000	$ 3,852,000
Payment-in-kind (PIK) interest \| CRG Term Loan
Debt Instrument [Line Items]
Debt interest rate, stated percentage								3.50%