Related Party Transactions (Detail) - USD ($) $ in Thousands				3 Months Ended		12 Months Ended
	Mar. 23, 2017	Feb. 14, 2017	May 03, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Gross amount				$ 0	$ 7,026
Common stock, shares outstanding				6,842,978		1,590,948
Debt issuance costs extinguished and recorded against equity				$ 107	0
Net proceeds on issuance stock				$ 27,398
Converted debt from CRG and WCAS
Related Party Transaction [Line Items]
Debt issuance costs extinguished and recorded against equity	$ 100
Term Loan | Converted debt from CRG and WCAS
Related Party Transaction [Line Items]
Original debt amount converted		$ 27,500
Term Loan | Converted debt from CRG
Related Party Transaction [Line Items]
Original debt amount converted	25,000
Term Loan | Converted debt from WCAS
Related Party Transaction [Line Items]
Original debt amount converted	$ 2,500
CRG
Related Party Transaction [Line Items]
Conversion of Private Company Series AA preferred stock to common stock					16,500
Gross amount					$ 13,200
Stock issued during period, shares				4,000,000
Net proceeds on issuance stock				$ 40,000
Series AB Preferred Stock | CRG
Related Party Transaction [Line Items]
Number of shares issued upon conversion of debt					8,609,824
Issuance of preferred stock as a result of the exercise of warrants shares					10,276,030
Number of shares issued upon exercise of warrants					314,761
Warrants held					10,379,800
Common Stock | Private Placement
Related Party Transaction [Line Items]
Proceeds from private placement						$ 24,000
Stock issued during period, shares						600,000
Common Stock | CRG
Related Party Transaction [Line Items]
Number of shares issued upon conversion of debt					4,649,859
Recapitalization for reverse merger, shares			685,970
Proceeds from private placement			$ 20,000
Common stock, shares outstanding			1,185,970
Common Stock | CRG | Private Placement
Related Party Transaction [Line Items]
Stock issued during period, shares			500,000
Common Stock | Series AB Preferred Stock | CRG
Related Party Transaction [Line Items]
Conversion to common stock, shares					256,744
Preferred Stock
Related Party Transaction [Line Items]
Stock issued during period, shares				2,750,000
Net proceeds on issuance stock				$ 3
Preferred Stock | Converted debt from CRG
Related Party Transaction [Line Items]
Number of shares issued upon conversion of debt	2,500,000
Preferred Stock | Converted debt from WCAS
Related Party Transaction [Line Items]
Number of shares issued upon conversion of debt	250,000
Restructured debt | Series AB Preferred Stock
Related Party Transaction [Line Items]
Conversion of Private Company Series AA preferred stock to common stock			$ 2,100	$ 2,100
Number of shares issued upon conversion of debt			1,660,530	1,660,530
Restructured debt | Common Stock
Related Party Transaction [Line Items]
Conversion to common stock, shares			49,526	49,526