Debt - Notes Payable - Additional Information (Detail)		1 Months Ended	12 Months Ended
	Jun. 28, 2013 USD ($) Agreement Entity	Feb. 28, 2015 USD ($)	Dec. 31, 2016 USD ($) Installment $ / shares shares	Dec. 31, 2015 USD ($)	Aug. 31, 2015 USD ($)	Jul. 31, 2015 USD ($)	Jan. 31, 2015 USD ($)
Debt Instrument [Line Items]
Loss on extinguishment of debt				$ 4,239,000
Change in fair value of warrant liabilities				(267,000)
Notes Payable [Member]
Debt Instrument [Line Items]
Number of loan and security agreements | Agreement	2
Number of financial entities | Entity	2
Debt instrument principal balance	$ 3,500,000				$ 21,000,000	$ 21,000,000
Proceeds from loans issued	$ 6,915,000
Interest rate			11.00%
Loan maturity date			Oct. 01, 2016
Interest only payments for initial			12 months
Number of installments | Installment			27
Termination payment percentage		3.00%	3.00%
Loan termination payment		$ 210,000	$ 210,000
Warrant or right securities called by warrants, amount			$ 350,000
Warrant expiration date			The warrants expire on the earlier of (i) ten years after the date of grant, or (ii) immediately prior to an acquisition transaction, as defined in the warrants.
Repaying principal amount		5,347,000
Prepayment fee		160,000
Interest accrued		$ 23,000
Debt instrument, principal payments							$ 243,000
Interest expense related to loan agreements				115,000
Accretion of debt discounts and loan termination payment				26,000
Loss on extinguishment of debt				323,000
Warrants issued to lenders exercisable to common shares | shares			56,408
Warrants issued to lenders exercisable to common shares, price per share | $ / shares			$ 6.204
Change in fair value of warrant liabilities				267,000
Reclassification of fair value of warrant liability to equity upon initial public offering				$ 215,000
Notes Payable [Member] | Warrants Exercisable for Common Stock [Member]
Debt Instrument [Line Items]
IPO price of the Company's common stock | $ / shares			$ 6.00
Fair value assumptions, expected term			8 years 4 months 24 days
Fair value assumptions, risk free interest rate			1.70%
Fair value assumptions, expected volatility rate			60.00%
Fair value of the warrant liability			$ 215,000
Notes Payable [Member] | Series AA Preferred Stock [Member]
Debt Instrument [Line Items]
Preferred stock issued to lenders | shares			228,906
Preferred stock issued to lenders, price per share | $ / shares			$ 1.529