Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 14,544	$ 29,147
Accounts receivable, net	4,724	4,267
Inventory	2,441	2,468
Prepaid expenses and other current assets	4,292	1,123
Total current assets	26,001	37,005
Property and equipment, net	1,493	1,359
Other assets	851	574
Total Assets	28,345	38,938
Current liabilities:
Accounts payable	2,928	2,513
Accrued expenses	7,731	7,511
Deferred revenue	1,686	1,970
Current portion of long-term debt	2,500
Total current liabilities	14,845	11,994
Long-term debt, net	27,497	29,556
Deferred revenue	2,124	2,275
Convertible preferred stock warrant liability	1,893	478
Deferred rent	121	151
Total Liabilities	46,480	44,454
Commitments and contingencies (Note 14)
Convertible preferred stock, $0.01 par value: 308,593 shares authorized, issuable in series; 304,958 shares issued and outstanding at June 30, 2018 and December 31, 2017; aggregate liquidation value of $108,324 at June 30, 2018	187,136	187,136
Stockholders’ deficit:
Preferred stock, $0.01 par value: no shares authorized, issued or outstanding at June 30, 2018 and December 31, 2017
Common stock, $0.01 par value: 413,918 shares authorized; 257 and 231 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	3	2
Additional paid-in capital	4,665	4,292
Accumulated deficit	(209,939)	(196,946)
Total Stockholder’s Deficit	(205,271)	(192,652)
Total Liabilities, Convertible Preferred Stock and Stockholders’ Deficit	$ 28,345	$ 38,938