Summary of Business and Significant Accounting Policies - Follow-on Offering (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		1 Months Ended
	Mar. 31, 2019	Apr. 30, 2019	Mar. 31, 2019
Follow-on offering
Stock offering
Issuance of common stock			2,000
Share Price	$ 11.00		$ 11.00
Proceeds from follow-on public offering, net of issuance costs	$ 21,700
Underwriter commission incurred	1,600
Other offering costs	$ 282
Over-allotment
Stock offering
Issuance of common stock		149