Stockholders' Equity (Details) $ / shares in Units, $ in Thousands		6 Months Ended
	Jun. 11, 2018 USD ($) $ / shares shares	Jun. 30, 2019 vote $ / shares shares
Class of Stock [Line Items]
Number of votes per share | vote		1
Dividends declared (usd per share) | $ / shares		$ 0
Common stock warrants outstanding (in shares)		1,866,831
Common stock warrant exercise price (usd per share) | $ / shares		$ 8.16
Public Offering
Class of Stock [Line Items]
Number of shares issued (in shares)	5,750,000
Price per share (usd per share) | $ / shares	$ 22.25
Net proceeds received | $	$ 59,917
Discounts and commissions | $	3,678
Offering expenses payable | $	$ 373
The Company | Public Offering
Class of Stock [Line Items]
Number of shares issued (in shares)	2,875,000
Certain Stockholders | Public Offering
Class of Stock [Line Items]
Number of shares issued (in shares)	2,875,000