Long-Term Debt and Other Financing Arrangements - Convertible Promissory Notes - Additional Information (Detail)	1 Months Ended		12 Months Ended
	May 31, 2015 USD ($)	Apr. 30, 2015 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares	Dec. 31, 2015 USD ($) Installment	Dec. 31, 2013 USD ($) $ / shares shares	Sep. 30, 2013 USD ($)
Debt Instrument [Line Items]
Interest expense related to debt discount			$ 198,000	$ 837,000
Increase in fair value of warrant			197,000
Fees paid to lender			46,000	396,000
Loss on extinguishment of debt			0	(230,000)
Accrued interest			98,000	9,000
Repayment of accrued interest and prepayment fee			$ 1,319,000	2,658,000
Mahyco Convertible Promissory Note One [Member]
Debt Instrument [Line Items]
Debt instrument, face amount						$ 500,000
Mahyco Convertible Promissory Note Two [Member]
Debt Instrument [Line Items]
Debt instrument, face amount					$ 4,500,000
Mahyco Convertible Promissory Notes [Member]
Debt Instrument [Line Items]
Debt instrument term			5 years
Conversion price | $ / shares			$ 16.52
Percentage of price per share of recent offering for conversion price per share of notes outstanding			90.00%
Number of warrant to purchase common stock issued | shares					75,666
Common stock warrants, exercise price per share | $ / shares					$ 16.52
Warrant, vesting date			2013-12
Warrant, exercisable term			5 years
Interest expense related to convertible promissory note				747,000
Interest expense related to debt discount				536,000
Mahyco Convertible Promissory Notes [Member] | Prime Rate [Member]
Debt Instrument [Line Items]
Interest on the notes			2.00%
Additional Mahyco Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 5,000,000
Debt instrument term			5 years
Convertible debt			$ 5,000,000
Term Loan Borrowings from Unrelated Parties [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 20,000,000
Common stock warrants, exercise price per share | $ / shares		$ 5.32
Interest expense related to convertible promissory note				1,500,000
Interest expense related to debt discount				301,000
Interest rate terms description			Under this loan agreement, interest on the Term Loans accrued at a rate per annum equal to the greater of (i) 9.0% and (ii) a fluctuating rate of interest equal to three­month LIBOR as in effect from time to time plus 8.74%.
Repayment date of outstanding principal amounts and accrued interest			Nov. 01, 2018
Additional term payment due on maturity of term loan		$ 600,000
Common stock warrants issued | shares		1,503,760
Warrant liability, fair value		$ 356,000
Embedded derivative liability, fair value		$ 81,000
Fees paid to lender				290,000
Initial fair value of warrants and embedded derivative liability	$ 437,000
Debt instrument, violation or event of default description			In July 2015, the Company amended the Term Loans to include collateral of certain intellectual property rights in exchange for a waiver of the Company’s obligation to obtain a subordination agreement from Mahyco International with respect to the indebtedness the Company owed to them. In an event of default, the lenders could have accelerated and declared to be immediately due and payable the outstanding principal amount of the Term Loans and the Company’s other payment obligations under the agreement. In the case of a bankruptcy or insolvency event of default, the outstanding principal amount of the Term Loans and the Company’s other payment obligations under the loan agreement automatically would have accelerated and become due and payable. In addition, if an event of default occurred and continued under the loan agreement, the lenders could have exercised certain additional secured creditor remedies against the Company and against the assets that secured the Company’s obligations under the agreement.
Term Loan Borrowings from Unrelated Parties [Member] | Minimum [Member]
Debt Instrument [Line Items]
Stated interest rate on loan		9.00%
Term Loan Borrowings from Unrelated Parties [Member] | Three-month LIBOR [Member]
Debt Instrument [Line Items]
Interest on the notes		8.74%
Senior Secured Term Loan Facility [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 25,000,000	$ 25,000,000
Repayment date of outstanding principal amounts and accrued interest				Dec. 01, 2020
Additional term payment due on maturity of term loan				$ 600,000
Repayment of principal balance				20,000,000
Accrued interest, prepayment and other fees				1,300,000
Loss on extinguishment of debt				(1,200,000)
Unamortized debt discount				427,000
Deferred loan issuance fees				$ 58,000
Number of installments | Installment				36
Cash collateralized obligations			100.00%
Senior Secured Term Loan Facility [Member] | Prepayment Occurs After December 29, 2016 but Before December 29, 2017 [Member]
Debt Instrument [Line Items]
Prepayment fee as of outstanding principal amount percentage				3.00%
Senior Secured Term Loan Facility [Member] | Prepayment Occurs After December 29, 2017 [Member]
Debt Instrument [Line Items]
Prepayment fee as of outstanding principal amount percentage				1.00%
Senior Secured Term Loan Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Liquidity ratio			140.00%
Senior Secured Term Loan Facility [Member] | Prime Rate [Member]
Debt Instrument [Line Items]
Interest on the notes				0.90%
New Term Loan Facility [Member]
Debt Instrument [Line Items]
Convertible debt				$ 5,000,000
Repayment of principal balance				3,700,000
Accrued interest				154,000
Derivative liabilities				$ 1,600,000