Condensed Consolidated Balance Sheets (Parenthetical) $ in Thousands	Sep. 30, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares
Statement Of Financial Position [Abstract]
Accounts receivable, related party amount, current | $	$ 39	$ 88
Prepaid expenses and other current assets, related party amount | $	28,875	3,417
Accrued expenses related party amount, current | $	4,537	1,700
Deferred revenue current related party amount | $	47,725	102
Deferred revenue non-current related party amount | $	$ 11,871	$ 57,780
Common stock, shares authorized | shares	55,677,088	52,183,139
Common stock, shares issued | shares	55,446,359	52,160,798
Common stock, shares outstanding | shares	55,189,370	51,852,862
Common stock, conditional capital | shares	23,948,128	20,498,996
Treasury stock, shares | shares	256,989	307,936