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Stockholders' Equity - Restricted stock activities (Details) | 6 Months Ended
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Jun. 30, 2019 $ / shares shares
Restricted Stock Units (RSUs) |
Number of Nonvested Beginning | shares | 1,032,084
Number of Granted | shares | 309,000
Number of Forfeited | shares | (296,750)
Number of Vested | shares | (76,000)
Number of Nonvested Ending | shares | 968,334
Weighted Average Grant Date Fair Value Nonvested at December 31, 2018 | $ / shares | $ 7.77
Weighted Average Grant Date Fair Value Granted | $ / shares | 2.99
Weighted Average Grant Date Fair Value Forfeited | $ / shares | 7.98
Weighted Average Grant Date Fair Value Vested | $ / shares | 10.81
Weighted Average Grant Date Fair Value Nonvested at March 31, 2019 | $ / shares | $ 5.94
Restricted Stock [Member] |
Number of Nonvested Beginning | shares | 502,636
Number of Granted | shares | 50,000
Number of Nonvested Ending | shares | 552,636
Weighted Average Grant Date Fair Value Nonvested at December 31, 2018 | $ / shares | $ 5.76
Weighted Average Grant Date Fair Value Granted | $ / shares | 3.80
Weighted Average Grant Date Fair Value Nonvested at March 31, 2019 | $ / shares | $ 5.58

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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