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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