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Summary of Significant Accounting Policies - Summary (Details) $ / shares in Units, shares in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 14, 2018 | Dec. 31, 2019 USD ($) item $ / shares | Sep. 30, 2019 USD ($) $ / shares | Jun. 30, 2019 USD ($) $ / shares | Mar. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares | Sep. 30, 2018 USD ($) $ / shares | Jun. 30, 2018 USD ($) $ / shares | Mar. 31, 2018 USD ($) $ / shares | Dec. 31, 2019 USD ($) item segment $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($)
Segments |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business activities | item |  |  |  |  |  |  |  |  |  | 1 |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  |  | 1 |  |  |
Foreign Currency Translation |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation (loss) gain |  |  |  |  |  |  |  |  |  | $ (65,000) | $ 1,377,000 | $ (1,115,000) |
(Gain) loss from foreign currency translation adjustments |  |  |  |  |  |  |  |  |  | 200,000 | 1,600,000 | (1,000,000.0) |
Trading Securities |  |  |  |  |  |  |  |  |  |  |  |  |
Trading securities |  | $ 0 |  |  |  | $ 0 |  |  |  | 0 | 0 | 0 |
Restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash pledged for letter of credit |  | 8,800,000 |  |  |  | 8,800,000 |  |  |  | 8,800,000 | 8,800,000 |  |
Cash and cash equivalents |  | 62,430,000 |  |  |  | 29,821,000 |  |  |  | 62,430,000 | 29,821,000 | 24,508,000 |
Restricted cash |  | 9,326,000 |  |  |  | 8,775,000 |  |  |  | 9,326,000 | 8,775,000 |  |
cash, cash equivalents and restricted cash in the condensed consolidated statements of cash flows |  | $ 71,756,000 |  |  |  | 38,596,000 |  |  |  | $ 71,756,000 | 38,596,000 | 24,508,000 | $ 6,574,000
Number of Months from start of lease for adjustments to Letter of Credit | item |  | 37 |  |  |  |  |  |  |  | 37 |  |  |
Frequency of adjustment to Letter of Credit | 12 months |  |  |  |  |  |  |  |  | 12 months |  |  |
Adjustment rate of Letter of Credit (as a percent) |  |  |  |  |  |  |  |  |  | 20.00% |  |  |
Amount of Letter of Credit outstanding after adjustments |  | $ 2,000,000.0 |  |  |  |  |  |  |  | $ 2,000,000.0 |  |  |
Number of other irrevocable letters of credit outstanding | item |  | 2 |  |  |  |  |  |  |  | 2 |  |  |
Restricted cash pledged for office lease agreement |  | $ 400,000 |  |  |  |  |  |  |  | $ 400,000 |  |  |
Restricted cash pledged for credit card program |  | 200,000 |  |  |  |  |  |  |  | 200,000 |  |  |
Accounts Receivable |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts receivable |  | 1,240,000 |  |  |  | 660,000 |  |  |  | 1,240,000 | 660,000 | 600,000 |
Long Lived Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived asset impairment |  |  |  |  |  |  |  |  |  | $ 400,000 | 0 | 0 |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |
Practical expedient of transaction prices allocated to remaining performance obligations |  |  |  |  |  |  |  |  |  | true |  |  |
Practical expedient cost of obtaining contract |  |  |  |  |  |  |  |  |  | true |  |  |
Number of performance obligations that exist for majority of the contracts with customers | item |  |  |  |  |  |  |  |  |  | 1 |  |  |
Warranty period from date of shipment |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Advertising Costs |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising Costs |  |  |  |  |  |  |  |  |  | $ 2,500,000 | 1,800,000 | 2,100,000 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss - basic |  | $ 36,581,000 | $ (13,506,000) | $ (6,309,000) | $ (1,342,000) | $ 1,779,000 | $ (6,621,000) | $ (5,398,000) | $ (2,711,000) | $ 15,424,000 | $ (12,951,000) | $ (92,000) |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic | shares |  |  |  |  |  |  |  |  |  | 37,355 | 35,317 | 34,381 |
Common stock equivalents from outstanding common stock options | shares |  |  |  |  |  |  |  |  |  | 3,495 |  |  |
Common stock equivalents for ESPP | shares |  |  |  |  |  |  |  |  |  | 25 |  |  |
Common stock equivalents from unvested restricted stock units | shares |  |  |  |  |  |  |  |  |  | 270 |  |  |
Weighted average number of common shares outstanding - diluted | shares |  |  |  |  |  |  |  |  |  | 41,145 | 35,317 | 34,381 |
Basic net income (loss) per share (in dollars per share) | $ / shares |  | $ 0.92 | $ (0.37) | $ (0.17) | $ (0.04) | $ 0.05 | $ (0.19) | $ (0.15) | $ (0.08) | $ 0.41 | $ (0.37) | $ 0.00 |
Diluted net income (loss) per share (in dollars per share) | $ / shares |  | $ 0.84 | $ (0.37) | $ (0.17) | $ (0.04) | $ 0.04 | $ (0.19) | $ (0.15) | $ (0.08) | $ 0.37 | $ (0.37) | $ 0.00 |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of assets |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life/amortization period |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of assets |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life/amortization period |  |  |  |  |  |  |  |  |  | 11 years |  |  |

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