Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Stock Options and Changes During the Period (Details)

v3.19.2
Stockholders' Equity - Summary of Stock Options and Changes During the Period (Details)
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Equity [Abstract]  
Number of Options, Beginning Balance | shares 1,466,520
Number of Options, Granted | shares
Number of Options, Expired | shares (6,650)
Number of Options, Ending Balance | shares 1,459,870
Number of Options Vested and Expected to Vest | shares 1,459,870
Number of Options Vested and Exercisable | shares 1,118,984
Weighted Average Exercise Price, Beginning Balance | $ / shares $ 6.66
Weighted Average Exercise Price, Granted | $ / shares
Weighted Average Exercise Price, Expired | $ / shares 69.35
Weighted Average Exercise Price, Ending Balance | $ / shares 6.37
Weighted Average Exercise Price, Options vested and expected to vest | $ / shares 6.37
Weighted Average Exercise Price, Options vested and exercisable | $ / shares $ 7.60
Weighted Average Remaining Contractual Life, Beginning Balance 9 years 5 months 27 days
Weighted Average Remaining Contractual Life, Granted 0 years
Weighted Average Remaining Contractual Life, Expired 0 years
Weighted Average Remaining Contractual Life, Ending Balance 9 years 11 days
Weighted Average Remaining Contractual Life, Options vested and expected to vest 9 years 11 days
Weighted Average Remaining Contractual Life, Options vested and exercisable 8 years 11 months 15 days