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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Operating Activities |  |
Net (loss) income | $ (2,423) | $ 3,229
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |
Depreciation and amortization | 2,428 | 2,255
Loss on disposal of fixed assets | 5 |
Stock-based compensation | 7,935 | 3,465
Unrealized foreign currency gains | (624) | (229)
Change in fair value of stock warrant liability |  | (43)
Amortization of premium on short-term investments | 58 | 161
Deferred rent | 338 | 2
Change in operating assets and liabilities: |  |
Accounts receivable, net | (2,289) | (4,051)
Inventory | (1,368) | (1,579)
Prepaid expenses and other current assets | 721 | (131)
Restricted cash | 80 |
Accounts payable and accrued liabilities | 2,145 | 2,028
Other assets | (368) | (5)
Net cash provided by operating activities | 6,638 | 5,102
Investing activities |  |
Purchases of short-term investments | (45,766) | (35,825)
Proceeds from sale and maturities of short-term investments | 44,580 | 23,954
Purchases of property and equipment | (2,071) | (1,219)
Net cash used in investing activities | (3,257) | (13,090)
Financing activities |  |
Proceeds from exercise of stock options | 2,782 | 2,414
Proceeds from exercise of stock warrants |  | 50
Payments of secured notes |  | (4,410)
Share purchases under Employee Stock Purchase Plan | 968 | 793
Net cash provided by (used in) financing activities | 3,750 | (1,153)
Effect of exchange rate changes on cash and cash equivalents | (255) | (92)
Net increase (decrease) in cash and cash equivalents | 6,876 | (9,233)
Cash and cash equivalents at beginning of period | 6,494 | 21,572
Cash and cash equivalents at end of period | 13,370 | 12,339
Supplemental disclosures of cash flow information |  |
Interest paid |  | 197
Taxes paid | 64 | 63
Supplemental schedule of noncash investing and financing activities |  |
Reduction of liability upon vesting of stock options previously exercised for unvested stock | $ 3 | $ 42

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
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