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v3.19.1

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Cash flows from operating activities |  |
Net loss | $ (8,019) | $ (11,117)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 621 | 548
Stock-based compensation | 4,415 | 3,247
Amortization of debt discount and issuance costs | 26 | 64
Accretion of discounts on investments, net | (227) | (171)
Provision for doubtful accounts and contractual allowances | 4,709 | 2,680
Amortization of operating lease right-of-use assets | 1,183 |
Changes in operating assets and liabilities: |  |
Accounts receivable | (10,984) | (5,536)
Inventory | (442) | (174)
Prepaid expenses and other current assets | (169) | 790
Other assets | (365) | 409
Accounts payable | (333) | (950)
Accrued liabilities | (6,380) | (2,977)
Deferred rent |  | 66
Deferred revenue | 66 | (139)
Operating lease liabilities | (1,200) |
Net cash used in operating activities | (17,099) | (13,260)
Cash flows from investing activities |  |
Purchases of property and equipment | (1,635) | (1,108)
Purchases of available-for-sale investments | (9,616) | (5,437)
Maturities of available-for-sale investments | 37,700 | 28,004
Net cash provided by investing activities | 26,449 | 21,459
Cash flows from financing activities |  |
Proceeds from issuance of common stock, net | 2,120 | 877
Tax withholding upon vesting of restricted stock awards | (3,258) | (1,274)
Net cash used in financing activities | (1,138) | (397)
Net increase in cash, cash equivalents, and restricted cash | 8,212 | 7,802
Cash, cash equivalents and restricted cash beginning of period | 20,023 | 8,671
Cash, cash equivalents and restricted cash end of period | 28,235 | 16,473
Supplemental disclosures of cash flow information |  |
Interest paid | 411 | 787
Non-cash investing and financing activities |  |
Property, plant and equipment costs included in accounts payable and accrued liabilities | $ 38 | $ 80

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X
- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration