CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 16,520	$ 20,440
Prepaid expenses and other current assets	3,097	4,126
Total current assets	19,617	24,566
Property and equipment, net	45	198
Total assets	19,662	24,764
Current liabilities:
Accounts payable	2,497	1,940
Accrued and other current liabilities	2,762	3,813
Total current liabilities	5,259	5,753
Other liabilities	130	176
Total liabilities	5,389	5,929
Commitments and contingencies (Note 9)
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2015 and 2016; 335,273 shares issued and outstanding at December 31, 2015 and 2016, respectively; aggregate liquidation preference of $4,006,512 as of December 31, 2015 and 2016,
Common stock, $0.001 par value; 100,000,000 shares authorized at December 31, 2015 and 2016; 2,965,208 and 4,256,829 shares issued and outstanding at December 31, 2015 and 2016, respectively	4	3
Additional paid-in capital	350,051	342,587
Accumulated other comprehensive income (loss)	(743)	(596)
Accumulated deficit	(335,039)	(323,159)
Total stockholders' equity	14,273	18,835
Total liabilities and stockholders' equity	$ 19,662	$ 24,764

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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- 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).