Financial Liabilities - Additional Information (Detail) - USD ($)				1 Months Ended	12 Months Ended
	Dec. 04, 2015	Nov. 10, 2014	Aug. 08, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Aug. 14, 2013	Nov. 30, 2010
Debt Instrument [Line Items]
Borrowing capacity under credit facility				$ 10,000,000
Net proceeds from term loan and credit agreement				7,800,000
Debt issuance cost						$ 601,000
Warrant exercise price								$ 10.00	$ 26.50
Revolving credit agreement amendment date		Nov. 10, 2014
Revolving credit agreement date		Mar. 31, 2014
Credit facility and term loan maturity date		Mar. 31, 2017
Additional loan fee payable to lender		$ 75,000
Percentage of lender fee on revolving loan facility		0.333%
Fee payable to lender		$ 100,000
Opus Bank
Debt Instrument [Line Items]
Revolving credit agreement amendment date	Dec. 04, 2015
Credit agreement, financial covenant description					Tangible Net Worth. Permit the sum of the Consolidated Tangible Net Worth plus the amount shown on the Borrower’s current balance sheet for the 1994 Settlement Agreement to be less than the sum of $8,000,000 plus, an amount equal to 50% of the amount of any Cash proceeds from any equity or Subordinated Debt issued by the Borrower after December 1, 2015 as of the end of any fiscal quarter of the Borrower measured quarterly beginning at the end of the fiscal quarter ending December 31, 2015.
Percentage of Cash Proceeds from Equity or Subordinated Debt	50.00%
Maximum | Opus Bank
Debt Instrument [Line Items]
Consolidated tangible net worth amount	$ 8,000,000
Amended Credit Agreement
Debt Instrument [Line Items]
Amount borrowed under term loan					$ 18,300,000
Borrowing capacity under credit facility		$ 30,000,000
Credit facility and term loan maturity date		Nov. 10, 2017
Debt instrument, payment terms					monthly
Revolving credit facility interest rate term					Under the terms of the Amended Credit Agreement, both the principal amount of the Term Loan and the principal amount outstanding under the Revolving Loan Facility bear interest at a floating rate equal to: (a) if the Company holds more than $30.0 million in cash with Opus, the greater of (i) the prime rate plus 1.50% and (ii) 4.75%; (b) if the Company holds $30.0 million or less but more than $20.0 million in cash with Opus, the greater of (i) the prime rate plus 2.25% and (ii) 5.50%; or (c) if the Company holds $20.0 million or less in cash with Opus, the greater of (i) the prime rate plus 2.75% and (ii) 6.00%. Interest on both facilities continues to be payable monthly.
Scenario One | Amended Credit Agreement
Debt Instrument [Line Items]
Debt instrument, interest rate		4.75%
Scenario One | Amended Credit Agreement | Minimum
Debt Instrument [Line Items]
Cash held with opus		$ 30,000,000
Scenario Two | Amended Credit Agreement
Debt Instrument [Line Items]
Debt instrument, interest rate		5.50%
Scenario Two | Amended Credit Agreement | Minimum
Debt Instrument [Line Items]
Cash held with opus		$ 20,000,000
Scenario Two | Amended Credit Agreement | Maximum
Debt Instrument [Line Items]
Cash held with opus		$ 30,000,000
Scenario Three | Amended Credit Agreement
Debt Instrument [Line Items]
Debt instrument, interest rate		6.00%
Scenario Three | Amended Credit Agreement | Maximum
Debt Instrument [Line Items]
Cash held with opus		$ 20,000,000
Prime Rate | Scenario One | Amended Credit Agreement
Debt Instrument [Line Items]
Percentage points added to base rate		1.50%
Prime Rate | Scenario Two | Amended Credit Agreement
Debt Instrument [Line Items]
Percentage points added to base rate		2.25%
Prime Rate | Scenario Three | Amended Credit Agreement
Debt Instrument [Line Items]
Percentage points added to base rate		2.75%
Bank Term Loan
Debt Instrument [Line Items]
Write off of discounts on loan				500,000
Opus Bank
Debt Instrument [Line Items]
Amount borrowed under term loan				10,000,000
Borrowing capacity under credit facility				10,000,000
Amount drawn under credit facility				4,000,000			$ 2,000,000
Debt issuance cost				$ 170,000
Warrants issued to purchase common stock				100,000
Warrant exercise price				$ 9.90
Private placement warrant estimated volatility				92.09%
Private placement warrant dividend yield				0.00%
Private placement warrant expected life (in years)				5 years
Private placement warrant risk free interest rate				1.73%
Private placement warrant fair value				$ 800,000
Bank Revolving Loan Facility
Debt Instrument [Line Items]
Repaid on revolving credit facility			$ 1,700,000
Deferred charges				400,000
Bank Revolving Loan Facility | Opus Bank | Bank Term Loan
Debt Instrument [Line Items]
Payments of debt issuance costs				$ 900,000