Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net loss	$ (40,381)	$ (25,380)	$ (20,939)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	14	15	9
Non-cash interest expense:
Related party	8,756	6,007	4,955
Changes in the fair value of derivative instruments:
Related party	13,950	12,172	8,491
Others	(34)	(300)	(58)
Non-cash compensation	413	231	205
Loss on disposal of fixed assets			10
Changes in assets and liabilities excluding non-cash charges:
(Increase) decrease in accounts receivable	(455)		1
Decrease (increase) inventories	728	(1,361)	19
(Increase) in prepaid expenses and other current assets	(893)	(43)	(473)
Decrease in security deposits		10
Increase in accounts payable, accrued expenses	274	306	615
(Decrease) increase in other current liabilities		(30)	30
Increase in royalty payable	208
Increase in deferred revenue	14,631		10,002
Increase (decrease) in deferred lease and other liabilities	4	3	(2)
Total adjustments	37,596	17,010	823,804
Net cash provided by (used in) provided by operating activities	(2,785)	(8,370)	2,865
Cash flows from investing activities:
Decrease in restricted cash			247
Purchase of fixed assets			(46)
Net cash provided by investing activities			201
Cash flows from financing activities:
Proceeds from notes payable	12,000	8,000
Payments for debt issue costs			(497)
Net cash provided by (used in) financing activities	12,000	8,000	(497)
Net increase (decrease) in cash and cash equivalents	9,215	(370)	2,569
Cash and cash equivalents, beginning of year	3,683	4,053	1,484
Cash and cash equivalents, end of year	12,898	3,683	4,053
Non-cash investing and financing activities:
Debt discounts issued in debt modifications			4,041
Conversion of accrued interest to notes payable	$ 8,756	$ 5,542	$ 3,031