Stockholders' Equity - Restricted Stock Units (Details)	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Restricted Stock Units
Outstanding at beginning of period (in shares) | shares	155,031
Granted (in shares) | shares	110,800
Canceled/forfeited (in shares) | shares	(30,774)
Outstanding at end of period (in shares) | shares	235,057
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 5.23
Granted (in dollars per share) | $ / shares	2.61
Canceled/forfeited (in dollars per share) | $ / shares	7.14
Outstanding at end of period (in dollars per share) | $ / shares	$ 3.74
Weighted Average Remaining Contractual Life (in years)
Outstanding at end of period	8 years 10 months 24 days
Restricted Stock Units
Restricted Stock Units
Outstanding at beginning of period (in shares) | shares	6,603
Granted (in shares) | shares	19,200
Released (in shares) | shares	(20,068)
Canceled/forfeited (in shares) | shares	(1,255)
Outstanding at end of period (in shares) | shares	4,480
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 13.17
Granted (in dollars per share) | $ / shares	2.44
Released (in dollars per share) | $ / shares	3.96
Canceled/forfeited (in dollars per share) | $ / shares	12.40
Outstanding at end of period (in dollars per share) | $ / shares	$ 8.64
Weighted Average Remaining Contractual Life (in years)
Outstanding at end of period	7 years 3 months 18 days