Equity - Narrative (Details)															12 Months Ended
	Aug. 31, 2020 shares	Aug. 03, 2020 shares	Jul. 13, 2020 shares	May 24, 2020 shares	May 15, 2020 shares	Apr. 21, 2020 director shares	Jan. 10, 2020 shares	Jan. 01, 2020 USD ($) shares	Sep. 04, 2019 shares	Aug. 16, 2019 shares	Jul. 21, 2019 $ / shares shares	Jan. 04, 2019 shares	Dec. 07, 2016 shares	Jul. 21, 2014 shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Class of Stock [Line Items]
Common stock, shares authorized (in shares)															100,000,000	100,000,000
Common stock, par or stated value per share (in usd per share) | $ / shares															$ 0.0001	$ 0.0001
Proceeds from contributions to employee stock purchase plan | $															$ 191,000	$ 0
Stock-based compensation expense | $															$ 1,068,000	$ 1,766,000
Restated 2016 Plan
Class of Stock [Line Items]
Number of directors | director						1
Increase in number of shares that may be issued (in shares)				500,000
Number of shares authorized to be issued (in shares)				1,650,000
UPOs
Class of Stock [Line Items]
Number of options issued (in shares)														300,000
Number of cashless options exercised (in shares)													282,900
Number of rights (in shares)											1
Number of warrants exercised (in shares)											1
Number of warrants per each share of common stock (in shares)											0.50
Warrant exercise price (in usd per share) | $ / shares											$ 11.50
Number of rights per each share of common stock (in shares)											0.10
Service-based RSUs | Restated 2016 Plan
Class of Stock [Line Items]
Number of awards granted (in shares)															275,133	274,851
Service-Based RSUs
Class of Stock [Line Items]
Number of awards granted (in shares)															178,633	268,851
Vesting period															3 years
Service-Based RSUs | Restated 2016 Plan
Class of Stock [Line Items]
Number of stock issued (in shares)					54,180	5,334	97,571		40,993	4,832		50,222
Service-Based RSUs | Restated 2016 Plan | Former Chief Financial Officer
Class of Stock [Line Items]
Number of stock issued (in shares)	10,000						7,334
Employee stock purchase plan | ESPP
Class of Stock [Line Items]
Number of stock issued (in shares)		472	30,353
Number of shares authorized to be issued (in shares)								500,000
Purchase price of common stock, percent of fair market value								85.00%
Maximum contribution percentage								10.00%
Maximum contribution amount | $								$ 5,000
Offering period								6 months
Discount percentage from market price, beginning of purchase period								15.00%
Vesting period								6 months
Proceeds from contributions to employee stock purchase plan | $															$ 200,000
Stock-based compensation expense | $															$ 34,000
Redeemable Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)															1,000,000	1,000,000
Preferred stock, par value (in usd per share) | $ / shares															$ 0.0001	$ 0.0001
Common Stock | UPOs
Class of Stock [Line Items]
Number of stock issued (in shares)											1		121,173