Fair value of warrant derivative liabilities at issuance recorded as debt discount.

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- Definition

Maximum percentage of prepayment fees.

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Minimum percentage of prepayment fees.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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- Definition

Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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No definition available.

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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Amount of the required periodic payments including both interest and principal payments.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Debt - Loan and Security Agreement and Warrant Agreement - Additional Information (Detail) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) d $ / shares	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 11, 2015 USD ($)
Debt Instrument [Line Items]
Fair value of warrant derivative liabilities at issuance, recorded as debt discount	$ 35		$ 35	$ 11
Hercules Loan and Security Agreement [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Term loan principal amount					$ 7,000
Debt instrument basis spread	8.50%
Basis of debt instrument interest rate	The prime rate as reported by The Wall Street Journal minus 3.25% plus (b) 8.50%.
Debt instrument payment terms	The Company is required to make interest payments in cash on the first business day of each month, beginning on July 1, 2015. Beginning on August 1, 2016, the Company will be required to make monthly payments on the first business day of each month consisting of principal and interest based upon a 30-month amortization schedule
Debt instrument periodic payment frequency	30-month amortization schedule
Repayment charges	$ 245
Percentage of prepayment fee	1.00%
Percentage of prepayment fee	3.00%
Maximum principal amount available for conversion into common shares	$ 1,000
Debt instrument, convertible, stock price trigger \| $ / shares	$ 11.73
Debt instrument, convertible, threshold trading days \| d	7
Interest expense	$ 187	$ 223
Interest expense payable in cash	$ 139	$ 173
Hercules Loan and Security Agreement [Member] \| Term Loan [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Floating annual rate	9.50%
Hercules Loan and Security Agreement [Member] \| Term Loan [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Debt instrument basis spread	3.25%