Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Right-of-use assets obtained in exchange for lease obligations	$ 24,257	$ 0
Operating activities
Net loss	(21,898)	(19,202)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,177	905
Amortization of right-of-use assets	651	0
Stock-based compensation expense	2,882	2,945
Amortization of premium on short-term investments	(6)	66
Amortization of deferred financing costs	163	84
Conversion of accrued interest to long-term debt	453	370
Provision for bad debts	38	207
Inventory Write-down	442	0
Changes in operating assets and liabilities:
Accounts receivable	(833)	3,056
Inventory	(465)	817
Prepaid expenses and other assets	(1,377)	(1,082)
Accounts payable	(1,893)	716
Accrued liabilities	1,124	(1,804)
Accrued compensation and other employee benefits	(4,765)	(2,792)
Customer deposits	(2,226)	(2,190)
Deferred revenue	(833)	178
Operating lease liabilities	(811)	0
Deferred rent and other liabilities	0	(124)
Net cash used in operating activities	(28,177)	(17,850)
Investing activities
Purchases of property and equipment	(165)	(1,106)
Proceeds from sale of short-term investments	0	2,700
Proceeds from maturity of short-term investments	39,520	9,780
Purchases of short-term investments	(28,100)	(6,000)
Net cash provided by investing activities	11,255	5,374
Financing activities
Proceeds from sale of common stock, net	68,273	0
Proceeds from issuance of common stock warrants	697	748
Tax withholdings related to net share settlements of restricted stock units	(1,299)	(108)
Proceeds from issuance of common stock for employee stock purchase plan	939	767
Proceeds from exercise of stock options	8,075	411
Net cash provided by financing activities	76,685	1,818
Net increase (decrease) in cash, cash equivalents	59,763	(10,658)
Effect of exchange rate changes on cash and cash equivalents	(10)	28
Cash and cash equivalents
Beginning of period	24,356	26,279
End of period	84,109	$ 15,649
Cash and cash equivalents	$ 24,356

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The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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