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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ 181,271	$ (103,765)
Adjustments to reconcile net loss to net cash used in operating activities:
Impairment loss on Intangible Asset	28,638	0
Deferred Tax Benefit	(6,014)	0
Depreciation and amortization	2,719	2,771
Stock-based compensation	10,739	8,849
Amortization of debt issuance costs	1,087	957
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(50,917)	1,912
(Increase) decrease in inventory	204	(2,807)
(Increase) decrease in prepaid expenses and other current assets	(3,305)	1,039
Decrease in other assets	330	0
Decrease in accounts payable and other liabilities	(645)	(4,906)
Decrease in deferred revenue	(25,929)	(25,529)
Net cash provided by (used in) operating activities	138,178	(121,479)
Cash flows from investing activities:
Purchases of property and equipment	(70)	(58)
Purchases of investments	(176,987)	(84,475)
Maturities of investments	130,600	195,358
Net cash (used in) provided by investing activities	(46,457)	110,825
Cash flows from financing activities:
Proceeds from issuance of common stock	0	550
Repurchase of common stock	(941)	(972)
Proceeds from debt borrowings, net of fees	0	12,529
Repayment of debt borrowings, net of fees	(963)	(14,212)
Net cash used in financing activities	(1,904)	(2,105)
Net increase (decrease) in cash and cash equivalents	89,817	(12,759)
Cash and cash equivalents at beginning of period	80,386	61,661
Cash and cash equivalents at end of period	170,203
Supplemental disclosure of cash flow information:
Cash paid for interest	13,243	10,470
Supplemental disclosure of non-cash investing and financing activities:
Unrealized gain on investments	$ 48	$ 151

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

+ Details

Name:	us-gaap_UnrealizedGainLossOnInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration