Stockholders' Equity and Stock-Based Compensation Expense - Equity (Details) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 21, 2019 shares	Sep. 28, 2018 shares	Oct. 31, 2019 USD ($) item $ / shares shares	Mar. 31, 2020 shares	Dec. 31, 2019 shares
Initial Public Offering
Common Stock
Shares issued (in shares)		5,000,000
Preferred stock including accrued dividends, converted into common stock		8,084,414
Aspire
Common Stock
Shares issued (in shares)				0
Maximum amount committed to be purchased | $			$ 20.0
Term over which the purchase can be made			30 months
Threshold triggering closing price per share to issue purchase notice | $ / shares			$ 0.25
Maximum number of shares that can be purchased under purchase notice			50,000
Number of lowest closing sales price | item			3
Number of consecutive business days immediately preceding the purchase date			10 days
Maximum shares sold per business day			2,000,000
Volume-weighted average price notice, percentage of companys common stock			30.00%
Purchase price as a percentage of volume-weighted average price			97.00%
Number of commitment shares issued	104,167
Maximum number of shares sold	2,626,165
Commitment fee percentage	19.99%
Number of commitment shares purchased					50,000