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Stockholders' Equity - Summary of RSU Activity (Details) - RSU [Member] - 2013 Equity Incentive Plan
3 Months Ended
Mar. 31, 2019
installment
$ / shares
shares
Restricted Stock Units information  
Number of vesting installments | installment 3
NUMBER OF SHARES  
Unvested at beginning of period | shares 4,833
Granted | shares 0
Forfeited | shares 0
Vested | shares 4,833
Unvested at end of period | shares 0
WEIGHTED-AVERAGE GRANT DATE FAIR VALUE  
Unvested at beginning of period | $ / shares $ 4.61
Granted | $ / shares 0.00
Forfeited | $ / shares 0.00
Vested | $ / shares 4.61
Unvested at end of period | $ / shares $ 0.00