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Stockholders' Equity (Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Weighted-Average Fair Value per Share |  |  |  |
Weighted-Average Fair Value per Share, Options granted (in dollars per share) | $ 3.23 | $ 3.01 | $ 3.76 |
Weighted-Average Fair Value per Share, Options, expired (in dollars per share) | $ 4.90 |  |  |
Share-based compensation expense | $ 4,333 | $ 2,741 | $ 1,077 |
Stock Options [Member] |  |  |  |
Number of Options Outstanding |  |  |  |
Number of Options Outstanding at beginning of period (in shares) | 778,388 | 665,210 | 357,991 |
Number of Options Outstanding, options granted (in shares) | 137,586 | 420,616 | 386,797 |
Number of Options Outstanding, options exercised (in shares) | (43,101) | (106,338) | (435) |
Number of Options Outstanding, options forfeited (in shares) | (75,251) | (201,100) | (79,143) |
Number of Options Outstanding, options expired (in shares) | (37,903) |  |  |
Number of Options Outstanding at end of period (in shares) | 759,719 | 778,388 | 665,210 | 357,991
Number of Options Outstanding, Options vested and expected to vest (in shares) | 747,736 | 769,142 | 149,907 |
Number of Options Outstanding, Options vested and exercisable (in shares) | 482,731 | 244,631 | 149,907 |
Weighted-Average Exercise Price |  |  |  |
Weighted-Average Exercise Price, beginning of period (in dollars per share) | $ 5.75 | $ 4.39 | $ 1.40 |
Weighted-Average Exercise Price, options granted (in dollars per share) | 7.74 | 6.93 | 7.03 |
Weighted-Average Exercise Price, options exercised (in dollars per share) | 4.93 | 2.17 | 1.77 |
Weighted-Average Exercise Price, options forfeited (in dollars per share) | 7.01 | 5.62 | 3.87 |
Weighted-Average Exercise Price, options expired (in dollars per share) | 4.94 |  |  |
Weighted-Average Exercise Price, end of period (in dollars per share) | 6.06 | 5.75 | 4.39 | $ 1.40
Weighted-Average Exercise Price, Options vested and expected to vest (in dollars per share) | 6.04 | 5.72 | 1.58 |
Weighted-Average Exercise Price, Options vested and exercisable (in dollars per share) | $ 5.41 | $ 3.78 | $ 1.58 |
Weighted-Average Remaining Contractual Life (in years) | 7 years 8 months 23 days | 8 years 4 months 21 days | 8 years 9 months 11 days | 9 years 1 month 28 days
Weighted-Average Remaining Contractual Life, Options vested and expected to vest (in years) | 7 years 8 months 13 days | 8 years 4 months 13 days | 7 years 9 months 22 days |
Weighted-Average Remaining Contractual Life, Options vested and exercisable (in years) | 7 years 3 months 1 day | 6 years 10 months 28 days | 7 years 9 months 22 days |
Weighted-Average Fair Value per Share |  |  |  |
Weighted-Average Fair Value per Share, beginning (in dollars per share) | $ 5.75 | $ 2.37 | $ 0.79 |
Weighted-Average Fair Value per Share, Options granted (in dollars per share) | 3.23 | 6.93 | 3.76 |
Weighted-Average Fair Value per Share, Options exercised (in dollars per share) | 2.54 | 2.24 | 0.93 |
Weighted-Average Fair Value per Share, Options forfeited (in dollars per share) | 3.69 | 4.99 | 2.09 |
Weighted-Average Fair Value per Share, ending (in dollars per share) | $ 2.84 | $ 5.75 | $ 2.37 | $ 0.79
Aggregate intrinsic value of options vested | $ 800 | $ 600 |  |
Aggregate intrinsic value of options outstanding | 2,200 | 1,300 |  |
Aggregate intrinsic value of options exercised | 100 | 600 |  |
Aggregate intrinsic value of option vested and expected to vest | 2,200 | 1,300 |  |
Total fair value of employee options vested during the period | $ 1,000 | $ 800 |  |
Weighted-average grant date fair value of unvested shares (in dollars per share) | $ 3.45 | $ 3.53 |  |
Unrecognized compensation costs | $ 800 |  |  |
Unrecognized compensation costs, period of recognition (in years) | 1 year 4 months 21 days |  |  |
Proceeds from exercise of stock options | $ 212 |  |  |
Excess tax benefit recognized | 402 |  |  |
Tax benefit to be recognized | $ 148 |  |  |

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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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