Annual report pursuant to Section 13 and 15(d)

SCHEDULE I CONDENSED FINANCIAL INFORMATION OF REGISTRANT - PARENT COMPANY STATEMENTS OF CASH FLOWS (Details)

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SCHEDULE I CONDENSED FINANCIAL INFORMATION OF REGISTRANT - PARENT COMPANY STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items]          
Net cash provided (used) by operating activities     $ (113,008) $ (103,752) $ (109,229)
Cash flows from investing activities:          
Cash received in acquisition     0 0 56
Net cash used in investing activities     (65,943) (21,687) (95,565)
Cash flows from financing activities:          
Proceeds from the issuance of common stock     0 133,800 318,204
Tax payments for net share settlement of equity awards     (6,686) (5,734) (828)
Equity offering costs $ (3,600) $ (5,200) 0 (4,090) (5,707)
Net cash provided by financing activities     63,844 180,755 311,669
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect     (115,107) 55,316 106,875
Cash and cash equivalents, beginning of period     183,589 128,273 21,398
Cash, cash equivalents and restricted cash, end of period   128,273 68,482 183,589 128,273
Parent company          
Condensed Cash Flow Statements, Captions [Line Items]          
Net cash provided (used) by operating activities     6,686 (123,976) (312,553)
Cash flows from investing activities:          
Cash received in acquisition     0 0 56
Net cash used in investing activities     0 0 56
Cash flows from financing activities:          
Proceeds from the issuance of common stock     0 133,800 318,204
Tax payments for net share settlement of equity awards     (6,686) (5,734) 0
Equity offering costs     0 (4,090) (5,707)
Net cash provided by financing activities     (6,686) 123,976 312,497
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect     0 0 0
Cash and cash equivalents, beginning of period     0 0 0
Cash, cash equivalents and restricted cash, end of period   $ 0 $ 0 $ 0 $ 0