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Stockholders' Equity - Stock Options and a Summary of Activity (Details)
 6 Months Ended
Jun. 30, 2021
$ / shares
shares
Number of Options  
Outstanding at beginning of period (in shares) | shares 221,450
Granted (in shares) | shares 73,420
Canceled/forfeited (in shares) | shares (20,922)
Expired (in shares) | shares (1,500)
Outstanding at end of period (in shares) | shares 269,723
Vested and expected to vest at period end (in shares) | shares 222,177
Exercisable at period end (in shares) | shares 70,065
Weighted Average Exercise Price Per Share  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 3.45
Granted (in dollars per share) | $ / shares 5.48
Canceled/forfeited (in dollars per share) | $ / shares 4.15
Expired (in dollars per share) | $ / shares 53.50
Outstanding at end of period (in dollars per share) | $ / shares 3.68
Vested and expected to vest at period end (in dollars per share) | $ / shares 3.65
Exercisable at period end (in dollars per share) | $ / shares $ 4.07
Weighted Average Remaining Contractual Life (in years)  
Outstanding at end of period 8 years 7 months 6 days
Vested and expected to vest at period end 8 years 6 months
Exercisable at period end 7 years 10 months 24 days