Notes Payable - Additional Information (Detail) - USD ($)			3 Months Ended
	Apr. 01, 2016	Mar. 31, 2016	Mar. 31, 2016
Debt Instrument [Line Items]
Proceeds from notes payable			$ 12,500,000
Loan Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 15,000,000	$ 15,000,000
Proceeds from notes payable		12,500,000
Date of Loan and Security Agreement			Oct. 18, 2011
Loan proceeds to repay the outstanding principal		7,200,000
Repayment of outstanding principal		6,000,000	$ 6,000,000
Final payment fee		1,200,000	$ 1,200,000
Accrued interest		45,000
Facility fee		100,000
Legal fees		100,000
Legal fees incurred in connection with closing the loan		$ 49,000
Description of monthly interest payment			Payments under the Loan Agreement are monthly in arrears and interest-only for the first 12-months. Thereafter and until the scheduled maturity date of April 1, 2020, in addition to interest accrued during such period, the monthly payments will include an amount equal to the outstanding principal divided by 36 months, unless the interest only period is extended by a further six months, in which case the amortization period will be 30 months.
Line of credit facility final payment percentage		3.75%	3.75%
Percentage of penalty for prepaying loan before maturity		2.00%	2.00%
Percentage of penalty for prepaying loan after maturity		0.50%	0.50%
Prepayment penalty expiration date			Mar. 31, 2017
Maturity date			Apr. 01, 2020
Warrants Expiration Term		5 years
Number of warrants issued		1,248,012
Warrants exercise price for shares		$ 0.5409
Estimated fair value of warrants issued		$ 500,000	$ 500,000
Loan, Covenant description			Pursuant to the Loan Agreement, the Company is bound by a variety of affirmative covenants during the term of the Loan Agreement, including, without limitation, certain information delivery requirements, notice requirements and obligations to maintain certain insurance. Additionally, the Company is bound by certain negative covenants setting forth actions that are not permitted to be taken during the term of the Loan Agreement without the Lenders’ consent, including, without limitation, incurring certain additional indebtedness, making certain asset dispositions, entering into certain mergers, acquisitions or other business combination transactions or incurring any non-permitted lien or other encumbrance on the Company’s assets. Upon the occurrence of an event of default under the Loan Agreement (subject to cure periods for certain events of default), all amounts owed by the Company thereunder would begin to bear interest at a rate that is 5.0% higher than the rate that would otherwise be applicable and may be declared immediately due and payable by the Collateral Agent. Events of default under the Loan Agreement include, among other things, the following: the occurrence of certain bankruptcy events; the failure to make payments under the Loan Agreement when due; the occurrence of a material impairment on the Collateral Agent’s security interest over the collateral, a material adverse change in the business, operations or condition (financial or otherwise) of the Company or material impairment of the prospect of repayment of the obligations under the Loan Agreement; the occurrence of a default under certain other agreements entered into by the Company; the rendering of certain types of judgments against the Company; the revocation of certain government approvals of the Company; any breach by the Company of any covenant (subject to cure periods for certain covenants) made in the Loan Agreement; and the failure of any representation or warranty made by the Company in connection with the Loan Agreement to be correct in all material respects when made
Loan Agreement [Member] | Warrants to purchase shares of common stock [Member]
Debt Instrument [Line Items]
Common stock price		$ 0.54	$ 0.54
Exercise price		$ 0.5409	$ 0.5409
Risk-free interest rates		1.21%
Expected volatility		111.96%
Expected term		5 years
Dividend yield		0.00%
Loan Agreement [Member] | Extension of Maturity Date [Member]
Debt Instrument [Line Items]
Percentage of penalty for prepaying loan before maturity		1.00%	1.00%
Prepayment penalty expiration date			Mar. 31, 2018
Loan Agreement [Member] | LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		8.54%	8.54%
Loan Agreement [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Proceeds from notes payable	$ 2,500,000