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Stock-based Compensation (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of ownership interest |  |  |  | 51.20%
Share-based Compensation [Abstract] |  |  |  |
Share-based compensation expense | $ 1,630,000 | $ 922,000 | $ 1,815,000 |
Stock Option Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock, shares authorized (in shares) | 5,200,000 |  |  |
Maximum period for options grants in period | 10 years |  |  |
Maximum period for options exercises in period | 10 years |  |  |
Period for exercising vested option | 12 months |  |  |
Shares Available for Grant [Roll Forward] |  |  |  |
Beginning of the period (in shares) | 880,000 | 1,757,000 |  |
Increase in pool (in shares) | 1,200,000 |  |  |
Options granted (in shares) | (896,000) | (962,000) |  |
Options exercised (in shares) | 0 | 0 |  |
Options forfeited, cancelled or expired (in shares) | 200,000 | 85,000 |  |
End of the period (in shares) | 1,384,000 | 880,000 | 1,757,000 |
Number of Options Outstanding [Roll Forward] |  |  |  |
Beginning of the period (in shares) | 3,017,000 | 2,240,000 |  |
Option granted (in shares) | 896,000 | 962,000 |  |
Options exercised (in shares) | (323,000) | (100,000) |  |
Options forfeited, cancelled or expired (in shares) | (200,000) | (85,000) |  |
End of the period (in shares) | 3,390,000 | 3,017,000 | 2,240,000 |
Exercisable (in shares) | 1,835,000 |  |  |
Weighted Average Exercise Price [Roll Forward] |  |  |  |
Beginning of the period (in dollars per share) | $ 2.52 | $ 2.03 |  |
Option granted (in dollars per share) | 5.17 | 3.58 |  |
Options exercised (in dollars per share) | 1.89 | 2.19 |  |
Options forfeited, cancelled or expired (in dollars per share) | 3.11 | 2.00 |  |
End of the period (in dollars per share) | 3.25 | $ 2.52 | $ 2.03 |
Exercisable (in dollars per share) | $ 2.48 |  |  |
Total unrecognized compensation costs | $ 1,600,000 | $ 2,700,000 |  |
Weighted average recognition period | 2 years 6 months | 2 years 4 months 24 days |  |
Share-based Compensation [Abstract] |  |  |  |
Share-based compensation expense | $ 1,630,000 | $ 922,000 | $ 1,815,000 |
Weighted-average assumptions [Abstract] |  |  |  |
Expected life | 6 years 1 month 24 days | 6 years 2 months 16 days | 6 years 9 months 29 days |
Risk-free interest rates | 2.03% | 1.46% | 1.87% |
Volatility | 66.01% | 64.64% | 74.15% |
Dividend yield | 0.00% | 0.00% | 0.00% |
Stock Option Plan [Member] | Research and Development [Member] |  |  |  |
Share-based Compensation [Abstract] |  |  |  |
Share-based compensation expense | $ 668,000 | $ 312,000 | $ 456,000 |
Stock Option Plan [Member] | General and Administrative [Member] |  |  |  |
Share-based Compensation [Abstract] |  |  |  |
Share-based compensation expense | 841,000 | 610,000 | 1,359,000 |
Stock Option Plan [Member] | Sales and Marketing [Member] |  |  |  |
Share-based Compensation [Abstract] |  |  |  |
Share-based compensation expense | $ 121,000 | $ 0 | $ 0 |
Stock Option Plan [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of ownership interest | 10.00% |  |  |
Percentage of fair market value of common stock | 110.00% |  |  |
Stock Option Plan [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Term of options | 5 years |  |  |
Aggregate fair value of common stock | $ 100,000 |  |  |
Period of nontransferable for stock option grants | 3 months |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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