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The Company and its Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Sep. 23, 2021 shares | Sep. 15, 2021 | Jun. 09, 2020 USD ($) $ / shares shares | Jun. 30, 2021 shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) Segment Employee NumberOfContractor $ / shares shares | Dec. 31, 2020 USD ($) Employee NumberOfContractor shares | Dec. 31, 2019 Employee NumberOfContractor | Jul. 14, 2021 $ / shares shares
Company And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Entity incorporation date |  |  |  |  |  |  | Aug. 05, 1999 |  |  |
Reverse stock split |  |  | 1-for-10 |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | $ 11,233 | $ 11,233 | $ 22,141 |  |
Net loss |  |  |  |  |  |  | (38,627) | (29,932) |  |
Cash from operations |  |  |  |  |  |  | (38,476) | (10,560) |  |
Allowance for credit losses |  |  |  |  |  | 932 | 932 | 65 |  |
Bad debt expense recognized |  |  |  |  |  |  | $ 936 | 302 |  |
Number of reporting segment | Segment |  |  |  |  |  |  | 1 |  |  |
Foreign cash and cash equivalents |  |  |  |  |  | $ 432 | $ 432 | 822 |  |
Advertising expenses |  |  |  |  |  |  | 0 | 17 |  |
Net foreign currency transactions losses |  |  |  |  |  |  | $ 378 | $ 389 |  |
Number of employees | Employee |  |  |  |  |  |  | 77 | 263 | 402 |
Number of contractors | NumberOfContractor |  |  |  |  |  |  | 25 | 54 | 98 |
Percentage of reduction in force |  |  |  |  |  |  |  | 10.00% |  |
Restructuring cost |  |  |  |  |  |  |  | $ 1,663 |  |
Restructuring cost paid |  |  |  |  |  |  | $ 459 | 1,204 |  |
Cost of revenue |  |  |  |  |  |  |  | $ 100 |  |
Common stock, number of shares available for sale | shares |  | 41,637 |  |  |  |  |  |  |  |
Percentage of gross proceeds from sale of common stock |  | 3.00% |  |  |  |  |  |  |  |
Common stock, shares issued | shares |  |  |  |  |  | 18,808,885 | 18,808,885 | 6,631,039 |  |
Change in accounting principle, accounting standards update, adopted |  |  |  |  |  | true | true |  |  |
Change in accounting principle, accounting standards update, adoption date |  |  |  |  |  | Jan. 01, 2021 | Jan. 01, 2021 |  |  |
Change in accounting principle, accounting standards update, immaterial effect |  |  |  |  |  | true | true |  |  |
Accounting Standards Update [Extensible Enumeration] |  |  |  |  |  |  | us-gaap:AccountingStandardsUpdate201912Member |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Company And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs, shares | shares | [1] |  |  |  |  |  | 12,101,691 | 3,680,000 |  |
June 2021 ATM Program |  |  |  |  |  |  |  |  |  |
Company And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, number of shares available for sale | shares |  |  |  |  | 10,000 |  |  |  |  |
Percentage of gross proceeds from sale of common stock |  |  |  |  | 3.00% |  |  |  |  |
Common stock, shares issued | shares |  |  |  |  |  |  |  |  |  | 1,820,785
Net proceeds received from sale of common stock |  |  |  |  |  |  | $ 8,313 |  |  |
Sale of stock, weighted net average price per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 4.59
ATM Program |  |  |  |  |  |  |  |  |  |
Company And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, number of shares available for sale | shares |  |  |  |  |  | 21,600 | 21,600 |  |  |
Common stock, shares issued | shares |  |  |  |  |  | 10,280,906 | 10,280,906 |  |  |
Net proceeds received from sale of common stock |  |  |  |  |  | $ 19,389 |  |  |  |
Sale of stock, weighted net average price per share | $ / shares |  |  |  |  |  | $ 1.89 | $ 1.89 |  |  |
2020 Offering |  |  |  |  |  |  |  |  |  |
Company And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
IPO closing date |  |  |  | Jun. 09, 2020 |  |  |  |  |  |
2020 Offering | Common Stock |  |  |  |  |  |  |  |  |  |
Company And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs, shares | shares |  |  |  | 3,680,000 |  |  |  |  |  |
Shares issued and sold, price per share | $ / shares |  |  |  | $ 7.50 |  |  |  |  |  |
Proceeds from issuance of public offering |  |  |  | $ 25,086 |  |  |  |  |  |
Underwriting discounts and commissions |  |  |  | 1,656 |  |  |  |  |  |
Offering expenses paid |  |  |  | $ 689 |  |  |  |  |  |
India |  |  |  |  |  |  |  |  |  |
Company And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of employees | Employee |  |  |  |  |  |  |  | 317 |  |
Shenzhen |  |  |  |  |  |  |  |  |  |
Company And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of employees | Employee |  |  |  |  |  |  |  | 317 |  |
Non-Recurring Engineering Tooling and Purchased Software Licenses |  |  |  |  |  |  |  |  |  |
Company And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization costs |  |  |  |  |  |  | $ 72 | $ 2,303 |  |
Net book value |  |  |  |  |  | $ 26 | 26 | 90 |  |
Deferred costs |  |  |  |  |  | $ 2,345 | $ 2,345 | $ 2,889 |  |
[1] | Reflects the 1-for-10 reverse stock split that became effective on September 15, 2021. Refer to Note 1 – The Company and its Significant Accounting Policies for further information.

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