Financial Liabilities - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended			3 Months Ended			1 Months Ended	3 Months Ended							1 Months Ended
	Aug. 14, 2013	Mar. 31, 2014	Mar. 31, 2014 Bluehill ID	Dec. 31, 2013 Bluehill ID	Mar. 31, 2014 Bank Term Loan	Mar. 31, 2014 Opus Bank Installment	Mar. 31, 2014 Opus Bank Bank Term Loan and Revolving Loan Facility	Oct. 30, 2012 Hercules Technology Growth Capital Inc	Mar. 31, 2014 Hercules Technology Growth Capital Inc Installment	Mar. 31, 2013 Hercules Technology Growth Capital Inc	Oct. 30, 2012 Hercules Technology Growth Capital Inc Secured Notes	Oct. 30, 2012 Hercules Technology Growth Capital Inc Secured Notes Maximum	Oct. 30, 2012 Hercules Technology Growth Capital Inc Term Loan Facility Initial Draw	Mar. 05, 2013 Hercules Technology Growth Capital Inc First amendment	Apr. 22, 2013 Hercules Technology Growth Capital Inc Second amendment	Aug. 31, 2013 Hercules Technology Growth Capital Inc Third Amendment	Aug. 07, 2013 Hercules Technology Growth Capital Inc Third Amendment
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
Net proceeds from term loan and credit agreement		7,800,000
Credit facility and term loan maturity date						Mar. 31, 2017
Credit facility and term loan interest description						Bear interest at a floating rate equal to the greater of (i) the prime rate plus 2.75% and (ii) 6.00%
Additional interest above base rate						2.75%			7.75%
Minimum percentage of interest on credit facility and term loan facility						6.00%
Credit facility and term loan payment terms						Interest is payable monthly beginning on May 1, 2014. The principal balance of the Term Loan is payable in 24 equal monthly installments beginning on May 1, 2015.
Number of monthly installments						24			30
Debt instrument, first date of principal payment						May 01, 2015			May 01, 2013
Debt issuance cost						170,000		600,000
Warrants issued to purchase common stock						1,000,000
Warrant exercise price						0.99											0.71
Warrants exercise term (in years)						5 years										5 years
Private placement warrant estimated volatility	91.57%					92.09%
Private placement warrant risk free interest rate	1.08%					1.73%
Private placement warrant fair value	4,000,000					800,000											500,000
Payments of Debt Issuance Costs							900,000
Write off of discounts on loan		600,000			500,000
Term loan												10,000,000
Initial advance of the debt note received from lender at the time of issuance													7,500,000
Term loan, additional advance											10,000,000
Net proceeds from debt offering								6,900,000
Term loan, maturity date									Nov. 01, 2015
Term loan, interest rate term									bears interest at a rate of the greater of (i) the prime rate plus 7.75% and (ii) 11.00%
Interest rate									11.00%
Term loan, payment term									Interest on the Secured Note is payable monthly beginning on November 1, 2012, and the principal balance is payable in 30 equal monthly installments beginning on May 1, 2013
Payment of financing costs									150,000
Percentage of financing cost credited to the company if all advances are repaid on maturity									50.00%
Percentage of term charge and success fee from maximum term loan									5.00%
Additional loan fee payable to lender									1,000,000
Number of installments to pay fees									3
Debt instrument, additional fees, date of first installment payment									Oct. 30, 2013
Debt interest expense									400,000	400,000
Consideration paid in cash, fees														76,268	114,397		106,000
Warrants issued to purchase common stock																992,084
Additional interest expense		1,600,000
Write off of deferred cost		900,000
Prepayment Fees on Advances, Net		$ 100,000
Percentage of ownership			100.00%	0.00%