Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 22,578	$ 11,187
Available-for-sale marketable securities		13,959
Prepaid expenses and other current assets	1,283	507
Total current assets	23,861	25,653
Property and equipment, net	798	802
Restricted cash	154	171
Operating lease right-of-use assets	1,390
Intangible assets	77,090	77,090
Goodwill	15,682	15,682
Total assets	118,975	119,398
Current Liabilities:
Accounts payable	1,708	3,420
Collaboration and device development payable, net	1,972	2,576
Accrued expenses	3,226	6,465
Operating lease liabilities - current portion	750
Deferred revenue - current portion		198
Loans payable - current portion	161	7,974
Total current liabilities	7,817	20,633
Operating lease liabilities - non-current portion	794
Loans payable - non-current portion	4,608
Restructured debt liability - contingent milestone payments	15,000	15,000
Deferred tax liabilities	15,821	15,476
Other liabilities		175
Total liabilities	44,040	51,284
Stockholders' Equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized; 0 shares issued and outstanding at December 31, 2019 and December 31, 2018
Common stock, $0.001 par value; 120,000,000 shares authorized at December 31, 2019 and December 31, 2018; 13,697,420 and 10,711,088 shares issued at December 31, 2019 and December 31, 2018, respectively; 13,697,395 shares and 10,711,063 shares outstanding at December 31, 2019 and December 31, 2018, respectively	14	11
Additional paid-in capital	763,097	728,804
Accumulated deficit	(685,122)	(657,647)
Treasury stock (at cost); 25 shares	(3,054)	(3,054)
Total stockholders' equity	74,935	68,114
Total liabilities & stockholders' equity	$ 118,975	$ 119,398

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).