Stockholders' Equity - Common Stock Narrative (Details) - shares		12 Months Ended
	Jun. 12, 2018	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Stock issued (in shares)		1,994,929
Shares issued upon conversion (in shares)		333,333
Number of warrants exercised (in shares)		497,313	74,518
RSUs issued during period (shares)		22,057	18,609
Common Stock
Class of Stock [Line Items]
Stock issued during period including share-based compensation (in shares)			3,098,662
Stock issued (in shares)		4,761,754
Shares issued upon conversion (in shares)	1,476,667		1,476,667
Warrants exercised (in shares)		2,221,635	78,917
Pre-funded warrants exercised (in shares)		1,724,322
Number of warrants exercised (in shares)		497,313
Issuance of common stock for share rounding as a result of reverse stock split (in shares)		6,466	1,136
Underwriting Public Offering
Class of Stock [Line Items]
Number of warrants exercised (in shares)		497,000
Underwriting Public Offering | Common Stock
Class of Stock [Line Items]
Stock issued (in shares)	1,523,333	183,334	1,523,333