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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Financial Liabilities - Additional Information (Detail) - USD ($)								12 Months Ended
	Feb. 14, 2019	Feb. 06, 2019	May 31, 2018	Feb. 21, 2018	Feb. 14, 2018	Dec. 28, 2017	Feb. 08, 2017	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Payment of debt instrument, aggregate principal amount								$ 28,214,000	$ 58,741,000
Debt instrument, outstanding principal balance								13,579,000	13,736,000
Loss on extinguishment of debt								$ 1,369,000	788,000
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
Term Loan
Debt Instrument [Line Items]
Debt instrument, outstanding principal balance									5,000,000
Revolving Loan Facility
Debt Instrument [Line Items]
Debt instrument, outstanding principal balance								$ 11,579,000	$ 8,736,000
Notes Payable
Debt Instrument [Line Items]
Debt instrument, outstanding principal balance								$ 2,000,000
Notes Payable \| 3VR
Debt Instrument [Line Items]
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.
Notes Payable \| Subsequent Event \| 3VR
Debt Instrument [Line Items]
Debt instrument payment, principal and interest	$ 2,060,000
Loan and Security Agreements \| Revolving Loan Facility
Debt Instrument [Line Items]
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
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 \| Subsequent Event
Debt Instrument [Line Items]
Loan facility payable date		Feb. 08, 2021
Loan and Security Agreements \| Revolving Loan Facility \| Prime Rate
Debt Instrument [Line Items]
Percentage of interest rate							1.00%
Loan facility payable date								Feb. 08, 2019
Loan and Security Agreements \| Revolving Loan Facility \| Prime Rate \| Subsequent Event
Debt Instrument [Line Items]
Percentage of interest rate		0.75%
Loan and Security Agreements \| East West Bank \| Revolving Loan Facility
Debt Instrument [Line Items]
Borrowing capacity under credit facility							$ 16,000,000
Loan and Security Agreements \| East West Bank \| Revolving Loan Facility \| Subsequent Event
Debt Instrument [Line Items]
Borrowing capacity under credit facility		$ 20,000,000
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