Equity Incentive Plans - Summary of Non-vested Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of the activity of stock option awards, shares
Options non-vested, beginning balance (in shares)	781
Options granted (in shares)	480
Vested (in shares)	(242)
Forfeited (in shares)	(119)
Options non-vested, ending balance (in shares)	900	781
Options non vested, Wtd. avg. grant date fair value beginning balance (in dollars per share)	$ 3.99
Granted, Wtd. Avg. grant date fair value (in dollars per share)	1.59	$ 3.64	$ 5.91
Vested, Wtd. Avg. grant date fair value (in dollars per share)	3.79
Forfeited, Wtd. Avg. grant date fair value (in dollars per share)	3.40
Options non vested, Wtd. avg. grant date fair value ending balance (in dollars per share)	$ 2.87	$ 3.99