Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Shares authorized (in shares)	200,000,000	200,000,000
Shares issued (in shares)	52,080,552	45,906,162
Shares outstanding (in shares)	52,080,552	45,906,162
Long-term debt, net	$ 105,013	$ 74,531
Other liabilities	4,978	397
Common stock, 0.001 par value; 200,000,000 shares authorized at September 30, 2020 and December 31, 2019; 52,080,552 and 45,906,162 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	52	46
Additional paid-in capital	531,598	489,565
Accounts payable	6,069	3,625
Accrued expenses and other current liabilities	$ 37,281	$ 32,514