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Financial Liabilities - Additional Information (Detail) - USD ($)									3 Months Ended
	Feb. 14, 2019	Feb. 06, 2019	May 31, 2018	Feb. 21, 2018	Feb. 14, 2018	Feb. 08, 2018	Dec. 28, 2017	Feb. 08, 2017	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Payment of debt instrument, aggregate principal amount									$ 1,371,000	$ 10,952,000
Debt instrument, outstanding principal balance									$ 11,855,000		$ 13,579,000
3VR
Debt Instrument [Line Items]
Date of acquisition completed					Feb. 14, 2018				Feb. 14, 2018
Business combination, issuance of notes					$ 2,000,000
Repayment of indebtedness outstanding of acquiree				$ 3,600,000
Previous Lender
Debt Instrument [Line Items]
Warrants to purchase common stock cancelled									400,000
Revolving Loan Facility
Debt Instrument [Line Items]
Debt instrument, outstanding principal balance									$ 11,855,000		11,579,000
Notes Payable
Debt Instrument [Line Items]
Debt instrument, outstanding principal balance											$ 2,000,000
Notes Payable | 3VR
Debt Instrument [Line Items]
Debt instrument payment, principal and interest	$ 2,060,000
Business combination, issuance of notes					$ 2,000,000
Annual interest rate of notes					3.00%
Notes payable, description									The Company issued subordinated unsecured promissory notes (“notes payable”) in the aggregate principal amount of $2.0 million, with an annual interest rate of 3.0%, payable on the one year anniversary of the closing date.
Loan and Security Agreements
Debt Instrument [Line Items]
Line of credit facility customary fees and expenses including facility fees									$ 120,000
Loan and Security Agreements | Revolving Loan Facility
Debt Instrument [Line Items]
Loan facility payable date		Feb. 08, 2021
Borrowing capacity under non-formula line of credit								$ 3,000,000
Line of credit facility early termination fee percentage								1.00%
Interest payable monthly date									Mar. 01, 2017
Line of credit facility additional facility fees paid						$ 40,000
Loan and Security Agreements | Revolving Loan Facility | Minimum
Debt Instrument [Line Items]
Line of credit facility liquidity covenant in cash								$ 4,000,000
Loan and Security Agreements | Revolving Loan Facility | Prime Rate
Debt Instrument [Line Items]
Percentage of interest rate		0.75%						1.00%
Loan facility payable date									Feb. 08, 2019
Loan and Security Agreements | East West Bank | Revolving Loan Facility
Debt Instrument [Line Items]
Borrowing capacity under credit facility		$ 20,000,000						$ 16,000,000
Loan and Security Agreements | Venture Lending & Leasing VII and VIII, Inc. | Term Loan
Debt Instrument [Line Items]
Payment of debt instrument, aggregate principal amount			$ 10,000,000				$ 5,000,000
Debt instrument, outstanding principal balance							10,000,000
Debt instrument payment, principal and interest			5,200,000				5,900,000
Debt instrument, outstanding principal			4,600,000				5,000,000
Debt instrument, accrued and unpaid interest outstanding			600,000				900,000
Loss on extinguishment of debt			$ 1,400,000				$ 1,800,000
Loan and Security Agreements | Venture Lending & Leasing VII and VIII, Inc. | Term Loan Facility
Debt Instrument [Line Items]
Borrowing capacity under credit facility								$ 10,000,000

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