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Stockholders' Deficit - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands			2 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended
	May 03, 2016	Jan. 29, 2016	Mar. 31, 2016	Apr. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value					$ 0.001		$ 0.001
Common stock, shares authorized					300,000,000		300,000,000
Preferred stock, shares authorized					10,000,000
Gross proceeds from issuance of preferred stock					$ 5,819	$ 3,016
Outstanding accrued interest and prepayment premium conversion, converted amount					$ 17,934
Capital Royalty Partners Term Loan [Member] \| Restructured Debt [Member] \| Term Loan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding accrued interest and prepayment premium conversion, converted amount			$ 16,500
Capital Royalty Partners Term Loan [Member] \| Restructured Debt [Member] \| Notes Payable, Other Payables [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Debt extinguished	$ 700
Converted amount	1,400
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from private placement	$ 24,000
Recapitalization for reverse merger, shares	1,000,004				1,000,004
Common Stock [Member] \| Restructured Debt [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion to Common Stock, shares					396,201
Common Stock [Member] \| Capital Royalty Partners Term Loan [Member] \| Restructured Debt [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares converted	2,053,959
Common Stock [Member] \| Capital Royalty Partners Term Loan [Member] \| Restructured Debt [Member] \| Term Loan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares converted	4,649,859
Common Stock [Member] \| Capital Royalty Partners Term Loan [Member] \| Restructured Debt [Member] \| Notes Payable, Other Payables [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion to Common Stock, shares	396,201
Number of shares issued upon conversion of debt	1,660,530
Common Stock [Member] \| Private Placement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period	5,000,000				5,079,000
Share price	$ 5.00
Investor [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from private placement	$ 20,000
Series AB Preferred Stock [Member] \| Restructured Debt [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding accrued interest and prepayment premium conversion, converted amount					$ 2,100
Number of shares issued upon conversion of debt					1,660,530
Series AB Preferred Stock [Member] \| Capital Royalty Partners Term Loan [Member] \| Restructured Debt [Member] \| Term Loan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding accrued interest and prepayment premium conversion, converted amount	$ 16,500
Number of shares issued upon conversion of debt	8,609,824		8,609,824
Series AB Preferred Stock [Member] \| Capital Royalty Partners Term Loan [Member] \| Restructured Debt [Member] \| Notes Payable, Other Payables [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding accrued interest and prepayment premium conversion, converted amount	$ 2,100
Series AB Preferred Stock [Member] \| Private Placement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period		4,655,430
Gross proceeds from issuance of preferred stock		$ 5,800		$ 1,600			$ 7,400
Number of shares issued upon exercise of warrants				5,900,000
Series AB Preferred Stock [Member] \| Common Stock [Member] \| Capital Royalty Partners Term Loan [Member] \| Restructured Debt [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares converted			2,053,959
Series AB Preferred Stock [Member] \| Common Stock [Member] \| Capital Royalty Partners Term Loan [Member] \| Restructured Debt [Member] \| Term Loan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares converted			4,649,859
Series AB Preferred Stock [Member] \| Period 2 [Member] \| Private Placement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion to Common Stock, shares	1,110,613
Series AB Preferred Stock [Member] \| Warrant Exercises [Member] \| Private Placement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion to Common Stock, shares	1,407,476