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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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