Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018		Dec. 31, 2017
Related Party Transaction [Line Items]
Current portion of deferred revenue	$ 38,376	[1]	$ 42,870
Long-term portion of deferred revenue	$ 162,318	[1]	$ 193,527
Common stock, shares authorized	200,000,000		200,000,000
Common stock, shares issued	129,239,376		122,087,040
Common stock, shares outstanding	129,239,376		122,087,040
Related Parties, Aggregated
Related Party Transaction [Line Items]
Current portion of deferred revenue	$ 16,424		$ 29,155
Long-term portion of deferred revenue	$ 135,634		$ 157,628

[1] The current and long-term portion of deferred revenue from related parties, as previously reported, totaled $28,684 and $147,708, respectively. The effect of restatement caused decreases of $12,260 and $12,074, respectively, resulting in current and long-term deferred revenue from related parties, as restated, totaling $16,424 and $135,634, respectively.