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Stockholders' Equity - Additional Information (Detail) |  |  |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 30, 2019 shares | May 30, 2018 USD ($) $ / shares shares | Dec. 20, 2017 USD ($) $ / shares shares | Feb. 08, 2017 USD ($) $ / shares shares | Aug. 13, 2014 $ / shares shares | Mar. 31, 2019 $ / shares shares | Dec. 31, 2018 shares | Dec. 31, 2017 shares
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  | 10,000,000 |  |
Preferred stock, par value | $ / shares |  |  |  |  |  | $ 0.001 |  |
Preferred stock, outstanding |  |  |  |  |  | 0 | 0 |
Loan and Security Agreements | East West Bank | Revolving Credit Facility |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Borrowing capacity under credit facility | $ |  |  |  | $ 16,000,000 |  |  |  |
Loan and Security Agreements | Venture Lending & Leasing VII and VIII, Inc. | Term Loan Facility |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Borrowing capacity under credit facility | $ |  |  |  | $ 10,000,000 |  |  |  |
2014 Consultant Warrant |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Warrant exercise price | $ / shares |  |  |  |  | $ 10.70 | $ 10.70 |  |
Warrants expiration date |  |  |  |  | Aug. 13, 2019 |  |  |
EWB Warrant |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Warrants issued to purchase common stock |  |  |  | 40,000 |  |  |  |
Warrant exercise price | $ / shares |  |  |  | $ 3.64 |  | 3.64 |  |
Warrants expiration date |  |  |  | Feb. 08, 2022 |  |  |  |
Common stock warrants fair value | $ |  |  |  | $ 125,000 |  |  |  |
EWB Warrant | Estimated Volatility |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 78.8 |  |  |  |
EWB Warrant | Risk-Free Interest Rate |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 1.94 |  |  |  |
EWB Warrant | Expected Life |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 5 years |  |  |  |
EWB Warrant | Dividend Yield |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 0 |  |  |  |
VLL7 Warrant |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Warrants issued to purchase common stock |  |  |  | 290,000 |  |  |  |
Warrant exercise price | $ / shares |  |  |  | $ 2.00 |  |  |  |
Warrants expiration date |  |  |  | Feb. 08, 2022 |  |  |  |
Common stock warrants fair value | $ |  |  |  | $ 1,037,500 |  |  |  |
VLL7 Warrant | Estimated Volatility |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 78.8 |  |  |  |
VLL7 Warrant | Risk-Free Interest Rate |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 1.94 |  |  |  |
VLL7 Warrant | Expected Life |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 5 years |  |  |  |
VLL7 Warrant | Dividend Yield |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 0 |  |  |  |
VLL8 Warrant |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Warrants issued to purchase common stock |  |  |  | 290,000 |  |  |  |
Warrant exercise price | $ / shares |  |  |  | $ 2.00 |  |  |  |
Warrants expiration date |  |  |  | Feb. 08, 2022 |  |  |  |
Common stock warrants fair value | $ |  |  |  | $ 1,037,500 |  |  |  |
VLL8 Warrant | Estimated Volatility |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 78.8 |  |  |  |
VLL8 Warrant | Risk-Free Interest Rate |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 1.94 |  |  |  |
VLL8 Warrant | Expected Life |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 5 years |  |  |  |
VLL8 Warrant | Dividend Yield |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 0 |  |  |  |
Previous Lender |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Warrants to purchase common stock cancelled |  |  |  | 400,000 |  |  |  |
2017 Consultant Warrant |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Warrants issued to purchase common stock |  |  |  | 60,000 |  |  |  |
Warrant exercise price | $ / shares |  |  |  | $ 4.60 |  |  |  |
Warrants expiration date |  |  |  | Feb. 08, 2019 |  |  |  |
Common stock warrants fair value | $ |  |  |  | $ 119,000 |  |  |  |
Issuance of common stock net exercise of warrants | 10,449 |  |  |  |  |  |  |
2017 Consultant Warrant | Estimated Volatility |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 78.8 |  |  |  |
2017 Consultant Warrant | Risk-Free Interest Rate |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 1.22 |  |  |  |
2017 Consultant Warrant | Expected Life |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 2 years |  |  |  |
2017 Consultant Warrant | Dividend Yield |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Private placement warrant |  |  |  | 0 |  |  |  |
Maximum | Common Stock |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Shares issued, price per share | $ / shares |  |  |  |  |  | $ 4.00 |  |
Maximum | Common Stock | 2014 Consultant Warrant |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Warrants issued to purchase common stock |  |  |  |  | 85,000 |  |  |
Series A Participating Preferred Stock |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  | 40,000 |  |
Preferred stock, par value | $ / shares |  |  |  |  |  | $ 0.001 |  |
Preferred stock, outstanding |  |  |  |  |  | 0 | 0 |
Series B Preferred Stock |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  | 5,000,000 |  |
Preferred stock, par value | $ / shares |  |  | $ 0.001 |  |  | $ 0.001 |  |
Preferred stock, outstanding |  |  |  |  |  | 5,000,000 | 5,000,000 |
Shares issued, price per share | $ / shares |  |  | $ 4.00 |  |  |  |  |
Total purchase price payable | $ |  |  | $ 20,000,000 |  |  |  |  |
Convertible preferred stock, terms of conversion |  |  |  |  |  | Each Share shall be convertible into the Company’s common stock (i) following the sixth (6th) anniversary of the initial closing of the Private Placement or (ii) if earlier, during the thirty (30) day period following the last trading day of any period of three (3) or more consecutive trading days that the closing market price of the Company’s common stock exceeds $10.00. Each Share is convertible at the option of the holder of shares of Series B Preferred Stock into such number of shares of the Company’s common stock |  |
Convertible preferred stock, threshold closing market price of entity stock | $ / shares |  |  | $ 10.00 |  |  |  |  |
Percentage of beneficially ownership limitation in excess of outstanding common stock immediately after effect to applicable conversion |  |  | 19.90% |  |  |  |  |
Minimum conversion price | $ / shares |  |  |  |  |  | $ 3.27 |  |
Dividend payment terms |  |  |  |  |  | Each Share is entitled to an annual dividend of 5% for the first six (6) years following the issuance of such Share and 3% for each year thereafter, with the Company retaining the option to settle each year’s dividend after the tenth (10th) year in cash. The dividends accrue and are payable in kind upon such time as the Shares convert into the Company’s common stock. |  |
Annual dividend for first six years |  |  |  |  |  | 5.00% |  |
Annual dividend for each year after sixth year |  |  |  |  |  | 3.00% |  |
Price per share distributable to stockholders | $ / shares |  |  |  |  |  | $ 4.00 |  |
Series B Preferred Stock | Common Stock |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Preferred stock shares convertible into common stock |  |  |  |  |  | 5,208,000 |  |
Series B Preferred Stock | Private Placement at Initial Closing of Transaction | Tranche One |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  | 3,000,000 |  |  |  |  |
Shares issued, price per share | $ / shares |  |  | $ 4.00 |  |  |  |  |
Total purchase price payable | $ |  |  | $ 12,000,000 |  |  |  |  |
Series B Preferred Stock | Private Placement at Second Closing of Transaction |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  | 2,000,000 |  |  |  |  |
Shares issued, price per share | $ / shares |  |  | $ 4.00 |  |  |  |  |
Series B Preferred Stock | Private Placement at Second Closing of Transaction | Tranche Two |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  | 2,000,000 |  |  |  |  |  |
Shares issued, price per share | $ / shares |  | $ 4.00 |  |  |  |  |  |
Total purchase price payable | $ |  | $ 8,000,000 |  |  |  |  |  |
Series B Preferred Stock | Maximum |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  | 5,000,000
Preferred stock, issued |  |  | 5,000,000 |  |  |  |  |

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