Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 38,362	$ 22,402
Short-term investments	10,480	16,541
Accounts receivable, net of allowance for doubtful accounts of $3,039 and $3,296 at June 30, 2017 and December 31, 2016, respectively	15,006	16,371
Prepaid expenses and other current assets	20,251	17,002
Total current assets	84,099	72,316
Property, equipment and software, net	77,459	82,714
Goodwill	1,145	1,145
Amortizable intangible assets, net	930	1,219
Total assets	163,633	157,394
Liabilities and stockholders’ equity
Accounts payable	2,953	2,886
Accrued liabilities	30,452	23,128
Less current maturities	3,000	1,500
Total current liabilities	97,321	93,019
Long-term debt, net	55,092	56,142
Other liabilities, noncurrent	654	1,245
Total liabilities	154,799	152,894
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, $0.001 par value: 10,000,000 shares authorized, no shares issued or outstanding at June 30, 2017 and December 31, 2016	0	0
Common stock, $0.001 par value: 300,000,000 shares authorized, 69,437,866 and 67,979,486 shares issued and 60,877,344 and 59,420,774 shares outstanding at June 30, 2017 and December 31, 2016, respectively	69	68
Additional paid-in-capital	300,612	290,182
Treasury stock, at cost: 8,560,522 and 8,558,712 shares of common stock at June 30, 2017 and December 31, 2016, respectively	(23,734)	(23,719)
Accumulated deficit	(268,113)	(262,031)
Total stockholders’ equity	8,834	4,500
Total liabilities and stockholders’ equity	163,633	157,394
Deferred membership revenue [Member]
Liabilities and stockholders’ equity
Deferred revenue, current	20,255	23,208
Deferred revenue, noncurrent	1,404	2,032
Deferred advertising revenue [Member]
Liabilities and stockholders’ equity
Deferred revenue, current	40,661	42,297
Deferred revenue, noncurrent	$ 328	$ 456

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

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.