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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Operating activities: |  |
Net income (loss) | $ (8,116) | $ (39,609)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |
Depreciation of fixed assets | 5,610 | 6,813
Amortization of unfavorable lease obligation and debt issuance costs | 786 | 524
Amortization of debt discount | 6,283 | 4,362
Loss on early extinguishment of debt | 0 | 3,732
Loss on disposal of fixed assets | 10 | 2,030
Stock-based compensation | 15,432 | 14,744
Changes in operating assets and liabilities: |  |
Accounts receivable, net | (3,640) | 2,470
Inventories, net | (642) | (2,324)
Prepaid expenses and other assets | 102 | 1,849
Increase (Decrease) in Accounts Payable | (2,826) | 2,149
Accrued expenses and income taxes payable | (2,303) | 8,402
Other liabilities | 325 | (1,480)
Net cash provided by operating activities | 11,021 | 3,662
Investing activities: |  |
Purchases of fixed assets | (7,818) | (8,771)
Purchases of investments | (182,749) | (274,791)
Sales of investments | 244,562 | 82,782
Payment of contingent consideration | (4,715) | (4,206)
Net cash provided by (used in) investing activities | 49,280 | (204,986)
Financing activities: |  |
Proceeds from exercise of stock options | 1,492 | 2,613
Proceeds from Shares Issued Under Employee Stock Purchase Plans | 952 | 1,056
Proceeds from 2022 convertible senior notes | 0 | 345,000
Repayment of 2019 convertible senior notes | 0 | (118,191)
Payment of debt issuance and financing costs | 0 | (11,000)
Costs for conversions of convertible senior notes | 0 | (284)
Net cash provided by financing activities | 2,444 | 219,194
Net increase in cash and cash equivalents | 62,745 | 17,870
Cash and cash equivalents, beginning of period | 54,126 |
Cash and cash equivalents, end of period | 116,871 |
Supplemental cash flow information: |  |
Cash paid for interest | 4,102 | 2,384
Income Taxes Paid, Net | 146 | 133
Non-cash investing and financing activities: |  |
Issuance of common stock from conversion of 2019 convertible senior notes | 0 | 120,960
Retirement of equity component of 2019 convertible senior notes | 0 | (126,326)
Net increase in accrued fixed assets | $ 2,032 | $ 2,294

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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