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Stockholders' Equity - Summary of Warrant Activity (Details) | 12 Months Ended
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Dec. 31, 2017 $ / shares shares | Dec. 31, 2016 $ / shares shares | Dec. 31, 2015 $ / shares shares
Warrants Outstanding |  |  |
Beginning balance (in shares) | shares | 6,750 | 14,250 | 969,549
Warrants exercised (in shares) | shares |  |  | (638,189)
Warrants expired (in shares) | shares |  |  | (205,000)
Warrants canceled/forfeited (in shares) | shares | (6,750) | (7,500) | (112,110)
Ending balance (in shares) | shares | 0 | 6,750 | 14,250
Weighted Average Exercise Price During Period |  |  |
Beginning balance (in dollars per share) | $ / shares | 4.30 | 4.30 | 4.61
Warrants exercised (in dollars per share) | $ / shares |  |  | 4.58
Warrants expired (in dollars per share) | $ / shares |  |  | 4.20
Warrants canceled/forfeited (in dollars per share) | $ / shares | 4.30 | 4.30 | 5.54
Ending balance (in dollars per share) | $ / shares | 0.00 | 4.30 | 4.30

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures, Weighted Average Exercise Price + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Exercise Price + References No definition available. + Details
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- Definition Number of non-option equity instruments exercised by participants. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of shares under non-option equity instrument agreements for which rights to exercise lapsed. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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=96867065&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)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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