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Stockholders' Equity - Company's Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
OUTSTANDING OPTIONS
Outstanding at beginning of period	100,600
Outstanding at end of period		100,600
WEIGHTED-AVERAGE EXERCISE PRICE
Outstanding at beginning of period	$ 3.09
Outstanding at end of period		$ 3.09
ADDITIONAL DISCLOSURES
Outstanding options exercisable at end of period	1,500
Weighted-average exercise price exercisable at end of period	$ 2.06
Weighted-average contractual term (years) exercisable	9 years	9 years 6 months
Aggregate intrinsic value (in thousands) exercisable at end of period	$ 1
2003 Stock Incentive Plan
OUTSTANDING OPTIONS
Outstanding at beginning of period	97,250
Options exercised	(3,785)
Outstanding at end of period	93,465	97,250
WEIGHTED-AVERAGE EXERCISE PRICE
Outstanding at beginning of period	$ 1.96
Options granted	1.12
Outstanding at end of period	$ 2.00	$ 1.96
VESTED AND EXPECTED TO VEST
Weighted-Average Remaining Contractual Term	1 year	1 year 3 months 18 days
Aggregate Intrinsic Value (in thousands)	$ 95
2013 Equity Incentive Plan
OUTSTANDING OPTIONS
Outstanding at beginning of period	5,753,211
Options granted	823,400
Options exercised	0
Options forfeited	(253,817)
Outstanding at end of period	6,322,794	5,753,211
WEIGHTED-AVERAGE EXERCISE PRICE
Outstanding at beginning of period	$ 8.93
Options granted	3.80
Options forfeited	7.33
Outstanding at end of period	$ 8.34	$ 8.93
VESTED AND EXPECTED TO VEST
Outstanding options	6,322,794
Weighted-Average Exercise Price	$ 8.34
Weighted-Average Remaining Contractual Term	6 years 4 months 24 days
Aggregate Intrinsic Value (in thousands)	$ 2
ADDITIONAL DISCLOSURES
Outstanding options exercisable at end of period	4,038,025
Weighted-average exercise price exercisable at end of period	$ 9.50
Weighted-average contractual term (years) exercisable	5 years
Weighted-average contractual term outstanding	6 years 4 months 24 days	6 years 7 months 6 days
Aggregate intrinsic value (in thousands) outstanding at end of period	$ 2

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