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Summary of Significant Accounting Policies - Summary (Details) $ / shares in Units, shares in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) item $ / shares | Sep. 30, 2018 USD ($) $ / shares | Jun. 30, 2018 USD ($) $ / shares | Mar. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares | Sep. 30, 2017 USD ($) $ / shares | Jun. 30, 2017 USD ($) $ / shares | Mar. 31, 2017 USD ($) $ / shares | Dec. 31, 2018 USD ($) item $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares
Foreign Currency Translation |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | $ 1,377,000 | $ (1,115,000) | $ 542,000
Unrealized foreign currency losses (gains) |  |  |  |  |  |  |  |  | 1,647,000 | (951,000) | 368,000
Restricted cash |  |  |  |  |  |  |  |  |  |  |
Letter of Credit outstanding | $ 8,800,000 |  |  |  |  |  |  |  | 8,800,000 |  |
Restricted cash | $ 8,800,000 |  |  |  |  |  |  |  | $ 8,800,000 |  |
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 |  |
Adjustment rate of Letter of Credit (as a percent) |  |  |  |  |  |  |  |  | 20.00% |  |
Amount of Letter of Credit outstanding after adjustments | $ 2,000,000 |  |  |  |  |  |  |  | $ 2,000,000 |  |
Trading Securities |  |  |  |  |  |  |  |  |  |  |
Trading securities | 0 |  |  |  | $ 0 |  |  |  | 0 | 0 | 0
Accounts Receivable |  |  |  |  |  |  |  |  |  |  |
Allowance for bad debts | 660,000 |  |  |  | 592,000 |  |  |  | 660,000 | 592,000 |
Long Lived Assets |  |  |  |  |  |  |  |  |  |  |
Long-lived asset impairment |  |  |  |  |  |  |  |  | $ 0 | 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 |  |  |  |  |  |  |  |  | $ 1,800,000 | 2,100,000 | 1,600,000
Income Taxes |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets from Tax Cuts and Jobs Act of 2017 | 25,200,000 |  |  |  |  |  |  |  | 25,200,000 |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net (loss) income - basic and diluted | $ 1,779,000 | $ (6,621,000) | $ (5,398,000) | $ (2,711,000) | $ 1,006,000 | $ 1,325,000 | $ (3,301,000) | $ 878,000 | $ (12,951,000) | $ (92,000) | $ 4,522,000
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic | shares |  |  |  |  |  |  |  |  | 35,317 | 34,381 | 32,928
Common stock equivalents from outstanding common stock options | shares |  |  |  |  |  |  |  |  |  |  | 3,514
Common stock equivalents for ESPP | shares |  |  |  |  |  |  |  |  |  |  | 16
Common stock equivalents from outstanding common stock warrants | shares |  |  |  |  |  |  |  |  |  |  | 1
Weighted average number of common shares outstanding - diluted | shares |  |  |  |  |  |  |  |  | 35,317 | 34,381 | 36,459
Basic net (loss) income per share (in dollars per share) | $ / shares | $ 0.05 | $ (0.19) | $ (0.15) | $ (0.08) | $ 0.03 | $ 0.04 | $ (0.10) | $ 0.03 | $ (0.37) | $ 0.00 | $ 0.14
Diluted net (loss) income per share (in dollars per share) | $ / shares | $ 0.04 | $ (0.19) | $ (0.15) | $ (0.08) | $ 0.03 | $ 0.04 | $ (0.10) | $ 0.02 | $ (0.37) | $ 0.00 | $ 0.12
Minimum |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of assets |  |  |  |  |  |  |  |  | 3 years |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of assets |  |  |  |  |  |  |  |  | 5 years |  |

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