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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	Oct. 14, 2019	Jun. 26, 2019	Mar. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock warrants exercised (in shares)	2,728,513
Warrants liability			$ 3,074	$ 7,725
Series A Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in number of shares issuable (in shares)	2,728,513
Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of common stock (in shares)		2,728,513
Sale price per share (in dollars per share)		$ 7.33
Aggregate gross proceeds from sale		$ 20,000
Minimum volume weighted average price (in dollars per share)		$ 3.96
Ownership percentage threshold triggering warrants to be settled in cash		20.00%
Maximum common stock ownership percentage		4.99%
Maximum common stock ownership percentage if sixty days notice given		9.99%
Lock-up period		105 days
Private Placement | Series B-1 Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Anniversary of closing date (in months)		6 months
Number of shares callable by warrants (in shares)		2,347,418
Price of warrants (in dollars per share)		$ 8.52
Private Placement | Series B-2 Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Anniversary of closing date (in months)		12 months
Number of shares callable by warrants (in shares)		1,121,076
Price of warrants (in dollars per share)		$ 8.92
Percentage of VWAP determining forced exercise price		85.00%
Private Placement | Series A Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares callable by warrants (in shares)		5,457,026
Price of warrants (in dollars per share)		$ 12.00
Exercisable period (in years)		5 years
Private Placement | Series C Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period after first anniversary of closing date (in days)		90 days
Discount of VWAP (as a percent)		7.50%
Percentage of VWAP utilized at denominator of shares calculation		92.50%
Percentage of the price per initial share		50.00%
Private Placement | Series B-1 Or Series B-2 Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum common stock ownership percentage		4.99%

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